Merge branch 'master' into core-updates

9 files changed, 303 insertions, 134 deletions

diff --git a/guix/build/ant-build-system.scm b/guix/build/ant-build-system.scm
index d081a2b313..d79b4d503b 100644
--- a/guix/build/ant-build-system.scm
+++ b/guix/build/ant-build-system.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2016, 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -68,14 +68,11 @@
 
                  (target (@ (name "manifest"))
                          (mkdir (@ (dir "${manifest.dir}")))
-                         (echo (@ (file "${manifest.file}")
-                                  (message ,(string-append
-                                              (if main-class
-                                                (string-append
-                                                  "Main-Class: " main-class
-                                                  "${line.separator}")
-                                                "")
-                                              "")))))
+                         (manifest (@ (file "${manifest.file}"))
+                                   ,(if main-class
+                                       `(attribute (@ (name "Main-Class")
+                                                      (value ,main-class)))
+                                       "")))
 
                  (target (@ (name "compile"))
                          (mkdir (@ (dir "${classes.dir}")))
@@ -150,7 +147,8 @@ to the default GNU unpack strategy."
       (begin
         (mkdir "src")
         (with-directory-excursion "src"
-          (zero? (system* "jar" "-xf" source))))
+          (invoke "jar" "-xf" source))
+        #t)
       ;; Use GNU unpack strategy for things that aren't jar archives.
       ((assq-ref gnu:%standard-phases 'unpack) #:source source)))
 
@@ -171,7 +169,7 @@ to the default GNU unpack strategy."
 
 (define* (build #:key (make-flags '()) (build-target "jar")
                 #:allow-other-keys)
-  (zero? (apply system* `("ant" ,build-target ,@make-flags))))
+  (apply invoke `("ant" ,build-target ,@make-flags)))
 
 (define* (generate-jar-indices #:key outputs #:allow-other-keys)
   "Generate file \"META-INF/INDEX.LIST\".  This file does not use word wraps
@@ -181,10 +179,11 @@ grafting works - and so that the garbage collector doesn't collect
 dependencies of this jar file."
   (define (generate-index jar)
     (invoke "jar" "-i" jar))
-  (every (match-lambda
-           ((output . directory)
-            (every generate-index (find-files directory "\\.jar$"))))
-         outputs))
+  (for-each (match-lambda
+              ((output . directory)
+               (for-each generate-index (find-files directory "\\.jar$"))))
+            outputs)
+  #t)
 
 (define* (strip-jar-timestamps #:key outputs
                                #:allow-other-keys)
@@ -194,50 +193,49 @@ repack them.  This is necessary to ensure that archives are reproducible."
     (format #t "repacking ~a\n" jar)
     (let* ((dir (mkdtemp! "jar-contents.XXXXXX"))
            (manifest (string-append dir "/META-INF/MANIFEST.MF")))
-      (and (with-directory-excursion dir
-             (zero? (system* "jar" "xf" jar)))
-           (delete-file jar)
-           ;; XXX: copied from (gnu build install)
-           (for-each (lambda (file)
-                       (let ((s (lstat file)))
-                         (unless (eq? (stat:type s) 'symlink)
-                           (utime file 0 0 0 0))))
-                     (find-files dir #:directories? #t))
+      (with-directory-excursion dir
+        (invoke "jar" "xf" jar))
+      (delete-file jar)
+      ;; XXX: copied from (gnu build install)
+      (for-each (lambda (file)
+                  (let ((s (lstat file)))
+                    (unless (eq? (stat:type s) 'symlink)
+                      (utime file 0 0 0 0))))
+                (find-files dir #:directories? #t))
 
-           ;; The jar tool will always set the timestamp on the manifest file
-           ;; and the containing directory to the current time, even when we
-           ;; reuse an existing manifest file.  To avoid this we use "zip"
-           ;; instead of "jar".  It is important that the manifest appears
-           ;; first.
-           (with-directory-excursion dir
-             (let* ((files (find-files "." ".*" #:directories? #t))
-                    ;; To ensure that the reference scanner can detect all
-                    ;; store references in the jars we disable compression
-                    ;; with the "-0" option.
-                    (command (if (file-exists? manifest)
-                                 `("zip" "-0" "-X" ,jar ,manifest ,@files)
-                                 `("zip" "-0" "-X" ,jar ,@files))))
-               (unless (zero? (apply system* command))
-                 (error "'zip' failed"))))
-           (utime jar 0 0)
-           #t)))
+      ;; The jar tool will always set the timestamp on the manifest file
+      ;; and the containing directory to the current time, even when we
+      ;; reuse an existing manifest file.  To avoid this we use "zip"
+      ;; instead of "jar".  It is important that the manifest appears
+      ;; first.
+      (with-directory-excursion dir
+        (let* ((files (find-files "." ".*" #:directories? #t))
+               ;; To ensure that the reference scanner can detect all
+               ;; store references in the jars we disable compression
+               ;; with the "-0" option.
+               (command (if (file-exists? manifest)
+                            `("zip" "-0" "-X" ,jar ,manifest ,@files)
+                            `("zip" "-0" "-X" ,jar ,@files))))
+          (apply invoke command)))
+      (utime jar 0 0)
+      #t))
 
-  (every (match-lambda
-           ((output . directory)
-            (every repack-archive (find-files directory "\\.jar$"))))
-         outputs))
+  (for-each (match-lambda
+              ((output . directory)
+               (for-each repack-archive (find-files directory "\\.jar$"))))
+            outputs)
+  #t)
 
 (define* (check #:key target (make-flags '()) (tests? (not target))
                 (test-target "check")
                 #:allow-other-keys)
   (if tests?
-      (zero? (apply system* `("ant" ,test-target ,@make-flags)))
-      (begin
-        (format #t "test suite not run~%")
-        #t)))
+      (apply invoke `("ant" ,test-target ,@make-flags))
+      (format #t "test suite not run~%"))
+  #t)
 
 (define* (install #:key (make-flags '()) #:allow-other-keys)
-  (zero? (apply system* `("ant" "install" ,@make-flags))))
+  (apply invoke `("ant" "install" ,@make-flags)))
 
 (define %standard-phases
   (modify-phases gnu:%standard-phases
diff --git a/guix/build/go-build-system.scm b/guix/build/go-build-system.scm
index 7c833a616f..6be0167063 100644
--- a/guix/build/go-build-system.scm
+++ b/guix/build/go-build-system.scm
@@ -125,17 +125,17 @@ unset.  When SOURCE is a directory, copy it instead of unpacking."
         (copy-recursively source dest #:keep-mtime? #t)
         #t)
       (if (string-suffix? ".zip" source)
-        (zero? (system* "unzip" "-d" dest source))
-        (zero? (system* "tar" "-C" dest "-xvf" source))))))
+        (invoke "unzip" "-d" dest source)
+        (invoke "tar" "-C" dest "-xvf" source)))))
 
 (define* (install-source #:key install-source? outputs #:allow-other-keys)
   "Install the source code to the output directory."
   (let* ((out (assoc-ref outputs "out"))
          (source "src")
          (dest (string-append out "/" source)))
-    (if install-source?
-      (copy-recursively source dest #:keep-mtime? #t)
-      #t)))
+    (when install-source?
+      (copy-recursively source dest #:keep-mtime? #t))
+    #t))
 
 (define (go-package? name)
   (string-prefix? "go-" name))
@@ -178,24 +178,26 @@ respectively."
 
 (define* (build #:key import-path #:allow-other-keys)
   "Build the package named by IMPORT-PATH."
-  (or
-    (zero? (system* "go" "install"
-                    "-v" ; print the name of packages as they are compiled
-                    "-x" ; print each command as it is invoked
-                    ;; Respectively, strip the symbol table and debug
-                    ;; information, and the DWARF symbol table.
-                    "-ldflags=-s -w"
-                    import-path))
-    (begin
+  (with-throw-handler
+    #t
+    (lambda _
+      (invoke "go" "install"
+              "-v" ; print the name of packages as they are compiled
+              "-x" ; print each command as it is invoked
+              ;; Respectively, strip the symbol table and debug
+              ;; information, and the DWARF symbol table.
+              "-ldflags=-s -w"
+              import-path))
+    (lambda (key . args)
       (display (string-append "Building '" import-path "' failed.\n"
                               "Here are the results of `go env`:\n"))
-      (system* "go" "env")
-      #f)))
+      (invoke "go" "env"))))
 
 (define* (check #:key tests? import-path #:allow-other-keys)
   "Run the tests for the package named by IMPORT-PATH."
-  (if tests?
-    (zero? (system* "go" "test" import-path))))
+  (when tests?
+    (invoke "go" "test" import-path))
+  #t)
 
 (define* (install #:key outputs #:allow-other-keys)
   "Install the compiled libraries. `go install` installs these files to
diff --git a/guix/build/guile-build-system.scm b/guix/build/guile-build-system.scm
new file mode 100644
index 0000000000..0bed049436
--- /dev/null
+++ b/guix/build/guile-build-system.scm
@@ -0,0 +1,153 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build guile-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 rdelim)
+  #:use-module (guix build utils)
+  #:export (target-guile-effective-version
+            %standard-phases
+            guile-build))
+
+(define* (target-guile-effective-version #:optional guile)
+  "Return the effective version of GUILE or whichever 'guile' is in $PATH.
+Return #false if it cannot be determined."
+  (let* ((pipe (open-pipe* OPEN_READ
+                           (if guile
+                               (string-append guile "/bin/guile")
+                               "guile")
+                           "-c" "(display (effective-version))"))
+         (line (read-line pipe)))
+    (and (zero? (close-pipe pipe))
+         (string? line)
+         line)))
+
+(define (file-sans-extension file)                ;TODO: factorize
+  "Return the substring of FILE without its extension, if any."
+  (let ((dot (string-rindex file #\.)))
+    (if dot
+        (substring file 0 dot)
+        file)))
+
+(define %scheme-file-regexp
+  ;; Regexp to match Scheme files.
+  "\\.(scm|sls)$")
+
+(define %documentation-file-regexp
+  ;; Regexp to match README files and the likes.
+  "^(README.*|.*\\.html|.*\\.org|.*\\.md)$")
+
+(define* (set-locale-path #:key inputs native-inputs
+                          #:allow-other-keys)
+  "Set 'GUIX_LOCPATH'."
+  (match (assoc-ref (or native-inputs inputs) "locales")
+    (#f #t)
+    (locales
+     (setenv "GUIX_LOCPATH" (string-append locales "/lib/locale"))
+     #t)))
+
+(define* (build #:key outputs inputs native-inputs
+                (source-directory ".")
+                (compile-flags '())
+                (scheme-file-regexp %scheme-file-regexp)
+                target
+                #:allow-other-keys)
+  "Build files in SOURCE-DIRECTORY that match SCHEME-FILE-REGEXP."
+  (let* ((out        (assoc-ref outputs "out"))
+         (guile      (assoc-ref (or native-inputs inputs) "guile"))
+         (effective  (target-guile-effective-version guile))
+         (module-dir (string-append out "/share/guile/site/"
+                                    effective))
+         (go-dir     (string-append out "/lib/guile/"
+                                    effective "/site-ccache/"))
+         (guild      (string-append guile "/bin/guild"))
+         (flags      (if target
+                         (cons (string-append "--target=" target)
+                               compile-flags)
+                         compile-flags)))
+    (if target
+        (format #t "Cross-compiling for '~a' with Guile ~a...~%"
+                target effective)
+        (format #t "Compiling with Guile ~a...~%" effective))
+    (format #t "compile flags: ~s~%" flags)
+
+    ;; Make installation directories.
+    (mkdir-p module-dir)
+    (mkdir-p go-dir)
+
+    ;; Compile .scm files and install.
+    (setenv "GUILE_AUTO_COMPILE" "0")
+    (setenv "GUILE_LOAD_COMPILED_PATH"
+            (string-append go-dir
+                           (match (getenv "GUILE_LOAD_COMPILED_PATH")
+                             (#f "")
+                             (path (string-append ":" path)))))
+    (for-each (lambda (file)
+                (let* ((go (string-append go-dir
+                                          (file-sans-extension file)
+                                          ".go")))
+                  ;; Install source module.
+                  (install-file (string-append source-directory "/" file)
+                                (string-append module-dir
+                                               "/" (dirname file)))
+
+                  ;; Install and compile module.
+                  (apply invoke guild "compile" "-L" source-directory
+                         "-o" go
+                         (string-append source-directory "/" file)
+                         flags)))
+
+              ;; Arrange to strip SOURCE-DIRECTORY from file names.
+              (with-directory-excursion source-directory
+                (find-files "." scheme-file-regexp)))
+    #t))
+
+(define* (install-documentation #:key outputs
+                                (documentation-file-regexp
+                                 %documentation-file-regexp)
+                                #:allow-other-keys)
+  "Install files that mactch DOCUMENTATION-FILE-REGEXP."
+  (let* ((out (assoc-ref outputs "out"))
+         (doc (string-append out "/share/doc/"
+                             (strip-store-file-name out))))
+    (for-each (cut install-file <> doc)
+              (find-files "." documentation-file-regexp))
+    #t))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (delete 'bootstrap)
+    (delete 'configure)
+    (add-before 'install-locale 'set-locale-path
+      set-locale-path)
+    (replace 'build build)
+    (add-after 'build 'install-documentation
+      install-documentation)
+    (delete 'check)
+    (delete 'strip)
+    (delete 'validate-runpath)
+    (delete 'install)))
+
+(define* (guile-build #:key (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given Guile package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:phases phases args))
diff --git a/guix/build/haskell-build-system.scm b/guix/build/haskell-build-system.scm
index 268d59c1be..26519ce5a6 100644
--- a/guix/build/haskell-build-system.scm
+++ b/guix/build/haskell-build-system.scm
@@ -66,7 +66,7 @@
           (format #t "running \"runhaskell Setup.hs\" with command ~s \
 and parameters ~s~%"
                   command params)
-          (zero? (apply system* "runhaskell" setup-file command params)))
+          (apply invoke "runhaskell" setup-file command params))
         (error "no Setup.hs nor Setup.lhs found"))))
 
 (define* (configure #:key outputs inputs tests? (configure-flags '())
@@ -114,7 +114,8 @@ and parameters ~s~%"
       (setenv "CONFIG_SHELL" "sh"))
     (run-setuphs "configure" params)
 
-    (setenv "GHC_PACKAGE_PATH" ghc-path)))
+    (setenv "GHC_PACKAGE_PATH" ghc-path)
+    #t))
 
 (define* (build #:rest empty)
   "Build a given Haskell package."
diff --git a/guix/build/java-utils.scm b/guix/build/java-utils.scm
index 402d377bf8..128be1edeb 100644
--- a/guix/build/java-utils.scm
+++ b/guix/build/java-utils.scm
@@ -31,7 +31,7 @@
 
 (define* (ant-build-javadoc #:key (target "javadoc") (make-flags '())
                             #:allow-other-keys)
-  (zero? (apply system* `("ant" ,target ,@make-flags))))
+  (apply invoke `("ant" ,target ,@make-flags)))
 
 (define* (install-jars jar-directory)
   "Install jar files from JAR-DIRECTORY to the default target directory.  This
diff --git a/guix/build/meson-build-system.scm b/guix/build/meson-build-system.scm
index 6dac007a6d..9724764424 100644
--- a/guix/build/meson-build-system.scm
+++ b/guix/build/meson-build-system.scm
@@ -59,17 +59,14 @@
 
     (mkdir build-dir)
     (chdir build-dir)
-    (apply invoke "meson" args)
-    #t))
+    (apply invoke "meson" args)))
 
 (define* (build #:key parallel-build?
                 #:allow-other-keys)
   "Build a given meson package."
-  (apply invoke "ninja"
-         (if parallel-build?
-             `("-j" ,(number->string (parallel-job-count)))
-             '("-j" "1")))
-  #t)
+  (invoke "ninja" "-j" (if parallel-build?
+                           (number->string (parallel-job-count))
+                           "1")))
 
 (define* (check #:key test-target parallel-tests? tests?
                 #:allow-other-keys)
@@ -83,8 +80,7 @@
   #t)
 
 (define* (install #:rest args)
-  (invoke "ninja" "install")
-  #t)
+  (invoke "ninja" "install"))
 
 (define* (fix-runpath #:key (elf-directories '("lib" "lib64" "libexec"
                                                "bin" "sbin"))
diff --git a/guix/build/profiles.scm b/guix/build/profiles.scm
index 819688a913..df785c85a7 100644
--- a/guix/build/profiles.scm
+++ b/guix/build/profiles.scm
@@ -89,7 +89,7 @@ definitions for all the SEARCH-PATHS."
 # When GUIX_PROFILE is undefined, the various environment variables refer
 # to this specific profile generation.
 \n" port)
-      (let ((variables (evaluate-search-paths (cons $PATH search-paths)
+      (let ((variables (evaluate-search-paths search-paths
                                               (list output))))
         (for-each (write-environment-variable-definition port)
                   (map (abstract-profile output) variables))))))
diff --git a/guix/build/ruby-build-system.scm b/guix/build/ruby-build-system.scm
index abef6937bc..a346e9fb8e 100644
--- a/guix/build/ruby-build-system.scm
+++ b/guix/build/ruby-build-system.scm
@@ -52,18 +52,19 @@ directory."
 (define* (unpack #:key source #:allow-other-keys)
   "Unpack the gem SOURCE and enter the resulting directory."
   (if (gem-archive? source)
-      (and (zero? (system* "gem" "unpack" source))
-           ;; The unpacked gem directory is named the same as the archive,
-           ;; sans the ".gem" extension.  It is renamed to simply "gem" in an
-           ;; effort to keep file names shorter to avoid UNIX-domain socket
-           ;; file names and shebangs that exceed the system's fixed maximum
-           ;; length when running test suites.
-           (let ((dir (match:substring (string-match "^(.*)\\.gem$"
-                                                     (basename source))
-                                       1)))
-             (rename-file dir "gem")
-             (chdir "gem")
-             #t))
+      (begin
+        (invoke "gem" "unpack" source)
+        ;; The unpacked gem directory is named the same as the archive,
+        ;; sans the ".gem" extension.  It is renamed to simply "gem" in an
+        ;; effort to keep file names shorter to avoid UNIX-domain socket
+        ;; file names and shebangs that exceed the system's fixed maximum
+        ;; length when running test suites.
+        (let ((dir (match:substring (string-match "^(.*)\\.gem$"
+                                                  (basename source))
+                                    1)))
+          (rename-file dir "gem")
+          (chdir "gem"))
+        #t)
       ;; Use GNU unpack strategy for things that aren't gem archives.
       (gnu:unpack #:source source)))
 
@@ -104,7 +105,8 @@ generate the files list."
                   (write-char (read-char pipe) out))))
             #t)
           (lambda ()
-            (close-pipe pipe)))))))
+            (close-pipe pipe)))))
+    #t))
 
 (define* (build #:key source #:allow-other-keys)
   "Build a new gem using the gemspec from the SOURCE gem."
@@ -112,13 +114,13 @@ generate the files list."
   ;; Build a new gem from the current working directory.  This also allows any
   ;; dynamic patching done in previous phases to be present in the installed
   ;; gem.
-  (zero? (system* "gem" "build" (first-gemspec))))
+  (invoke "gem" "build" (first-gemspec)))
 
 (define* (check #:key tests? test-target #:allow-other-keys)
   "Run the gem's test suite rake task TEST-TARGET.  Skip the tests if TESTS?
 is #f."
   (if tests?
-      (zero? (system* "rake" test-target))
+      (invoke "rake" test-target)
       #t))
 
 (define* (install #:key inputs outputs (gem-flags '())
@@ -137,43 +139,42 @@ GEM-FLAGS are passed to the 'gem' invokation, if present."
                               0
                               (- (string-length gem-file-basename) 4))))
     (setenv "GEM_VENDOR" vendor-dir)
-    (and (let ((install-succeeded?
-                (zero?
-                 (apply system* "gem" "install" gem-file
-                        "--local" "--ignore-dependencies" "--vendor"
-                        ;; Executables should go into /bin, not
-                        ;; /lib/ruby/gems.
-                        "--bindir" (string-append out "/bin")
-                        gem-flags))))
-           (or install-succeeded?
-               (begin
-                 (simple-format #t "installation failed\n")
-                 (let ((failed-output-dir (string-append (getcwd) "/out")))
-                   (mkdir failed-output-dir)
-                   (copy-recursively out failed-output-dir))
-                 #f)))
-         (begin
-           ;; Remove the cached gem file as this is unnecessary and contains
-           ;; timestamped files rendering builds not reproducible.
-           (let ((cached-gem (string-append vendor-dir "/cache/" gem-file)))
-             (log-file-deletion cached-gem)
-             (delete-file cached-gem))
-           ;; For gems with native extensions, several Makefile-related files
-           ;; are created that contain timestamps or other elements making
-           ;; them not reproducible.  They are unnecessary so we remove them.
-           (if (file-exists? (string-append vendor-dir "/ext"))
-               (begin
-                 (for-each (lambda (file)
-                             (log-file-deletion file)
-                             (delete-file file))
-                           (append
-                            (find-files (string-append vendor-dir "/doc")
-                                        "page-Makefile.ri")
-                            (find-files (string-append vendor-dir "/extensions")
-                                        "gem_make.out")
-                            (find-files (string-append vendor-dir "/ext")
-                                        "Makefile")))))
-           #t))))
+
+    (or (zero?
+         (apply system* "gem" "install" gem-file
+                "--local" "--ignore-dependencies" "--vendor"
+                ;; Executables should go into /bin, not
+                ;; /lib/ruby/gems.
+                "--bindir" (string-append out "/bin")
+                gem-flags))
+        (begin
+          (let ((failed-output-dir (string-append (getcwd) "/out")))
+            (mkdir failed-output-dir)
+            (copy-recursively out failed-output-dir))
+          (error "installation failed")))
+
+    ;; Remove the cached gem file as this is unnecessary and contains
+    ;; timestamped files rendering builds not reproducible.
+    (let ((cached-gem (string-append vendor-dir "/cache/" gem-file)))
+      (log-file-deletion cached-gem)
+      (delete-file cached-gem))
+
+    ;; For gems with native extensions, several Makefile-related files
+    ;; are created that contain timestamps or other elements making
+    ;; them not reproducible.  They are unnecessary so we remove them.
+    (when (file-exists? (string-append vendor-dir "/ext"))
+      (for-each (lambda (file)
+                  (log-file-deletion file)
+                  (delete-file file))
+                (append
+                 (find-files (string-append vendor-dir "/doc")
+                             "page-Makefile.ri")
+                 (find-files (string-append vendor-dir "/extensions")
+                             "gem_make.out")
+                 (find-files (string-append vendor-dir "/ext")
+                             "Makefile"))))
+
+    #t))
 
 (define* (wrap-ruby-program prog #:key (gem-clear-paths #t) #:rest vars)
   "Make a wrapper for PROG.  VARS should look like this:
@@ -301,7 +302,8 @@ extended with definitions for VARS."
                 (let ((files (list-of-files dir)))
                   (for-each (cut wrap-ruby-program <> var)
                             files)))
-              bindirs)))
+              bindirs))
+  #t)
 
 (define (log-file-deletion file)
   (display (string-append "deleting '" file "' for reproducibility\n")))
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 25726b885e..74cb675fcf 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -46,6 +46,14 @@
             MNT_DETACH
             MNT_EXPIRE
             UMOUNT_NOFOLLOW
+
+            AT_FDCWD
+            AT_SYMLINK_NOFOLLOW
+            AT_REMOVEDIR
+            AT_SYMLINK_FOLLOW
+            AT_NO_AUTOMOUNT
+            AT_EMPTY_PATH
+
             restart-on-EINTR
             mount-points
             swapon
@@ -667,6 +675,15 @@ mounted at FILE."
     (* (file-system-block-size fs)
        (file-system-blocks-available fs))))
 
+;; Flags for the *at command, notably the 'utime' procedure of libguile.
+;; From <fcntl.h>.
+(define AT_FDCWD             -100)
+(define AT_SYMLINK_NOFOLLOW #x100)
+(define AT_REMOVEDIR        #x200)
+(define AT_SYMLINK_FOLLOW   #x400)
+(define AT_NO_AUTOMOUNT     #x800)
+(define AT_EMPTY_PATH       #x1000)
+
 
 ;;;
 ;;; Containers.