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-rw-r--r--src/mesa/main/imports.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/main/imports.c b/src/mesa/main/imports.c
index 25080db40c4..c3993510967 100644
--- a/src/mesa/main/imports.c
+++ b/src/mesa/main/imports.c
@@ -756,7 +756,7 @@ _mesa_strdup( const char *s )
float
_mesa_strtof( const char *s, char **end )
{
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) && !defined(__CYGWIN__)
static locale_t loc = NULL;
if (!loc) {
loc = newlocale(LC_CTYPE_MASK, "C", NULL);