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-rw-r--r--libraries/integer-gmp/configure.ac2
1 files changed, 2 insertions, 0 deletions
diff --git a/libraries/integer-gmp/configure.ac b/libraries/integer-gmp/configure.ac
index 0bd91887b8..067217e7c3 100644
--- a/libraries/integer-gmp/configure.ac
+++ b/libraries/integer-gmp/configure.ac
@@ -10,6 +10,8 @@ AC_ARG_WITH([cc],
[C compiler],
[CC=$withval])
AC_PROG_CC()
+dnl make extensions visible to allow feature-tests to detect them lateron
+AC_USE_SYSTEM_EXTENSIONS
dnl--------------------------------------------------------------------