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-rw-r--r--libstdc++-v3/include/Makefile.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index 3f1abd3e1..f6747445b 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -1127,7 +1127,7 @@ pch_output_dirs = \
pch_output_anchors = \
${pch1_output_anchor} ${pch2_output_anchor} ${pch3_output_anchor}
-PCHFLAGS = -x c++-header -nostdinc++ $(CXXFLAGS)
+PCHFLAGS = -x c++-header -nostdinc++ $(CXXFLAGS) -D_GNU_SOURCE
@GLIBCXX_BUILD_PCH_FALSE@pch_build =
@GLIBCXX_BUILD_PCH_TRUE@pch_build = ${pch_output}