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-rw-r--r--posix/regex.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/posix/regex.c b/posix/regex.c
index 815e2ec769..991eedc826 100644
--- a/posix/regex.c
+++ b/posix/regex.c
@@ -17,6 +17,8 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#define __STDC_WANT_IEC_60559_BFP_EXT__
+
 #ifndef _LIBC
 # include <libc-config.h>