osx: Add -D_DARWIN_C_SOURCE to CFLAGS

OSX doesn't like _POSIX_C_SOURCE being defined when _DARWIN_C_SOURCE isn't.

diff --git a/configure b/configure
index 732b6c942e6a391b8f8d5db2d1f173e2627411da..f9856bd7f55736313b82661ebffb046733cfba3f 100755 (executable)
--- a/configure
+++ b/configure
@@ -570,6 +570,7 @@ case $host_os in
     darwin*)
         SYS="MACOSX"
         libm="-lm"
+        CFLAGS="$CFLAGS -D_DARWIN_C_SOURCE"
         if [ "$pic" = "no" ]; then
             cc_check "" -mdynamic-no-pic && CFLAGS="$CFLAGS -mdynamic-no-pic"
         fi