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-rw-r--r--gnu/packages/gtk.scm4
1 files changed, 3 insertions, 1 deletions
diff --git a/gnu/packages/gtk.scm b/gnu/packages/gtk.scm
index 2d35ac48b7..3ae2d70af9 100644
--- a/gnu/packages/gtk.scm
+++ b/gnu/packages/gtk.scm
@@ -253,8 +253,10 @@ functions which were removed.")
     (build-system waf-build-system)
     (arguments
      `(#:phases (alist-cons-before
-                 'configure 'set-ldflags
+                 'configure 'set-flags
                  (lambda* (#:key outputs #:allow-other-keys)
+                   ;; Compile with C++11, required by gtkmm.
+                   (setenv "CXXFLAGS" "-std=c++11")
                    ;; Allow 'bin/ganv_bench' to find libganv-1.so.
                    (setenv "LDFLAGS"
                            (string-append "-Wl,-rpath="