Hello,

I'm having a problem trying to port a program. The configure runs a test that fails for an option of the strftime() function that is supposed to be C99 standard.

I have tried adding -std=c99 to the CFLAGS but no difference. This is the piece of code causing the failure:


---
AC_CACHE_CHECK([whether strftime supports %z], ob_cv_strftime_z,
[AC_TRY_RUN(
[#include <time.h>
#include <string.h>

int main(void)
{
time_t t = 0;
char buf[32];
strftime(buf, sizeof(buf), "%z", localtime(&t));
return !(buf[0] == '+' || buf[0] == '-');
}
], [ob_cv_strftime_z=yes], [ob_cv_strftime_z=no], [ob_cv_strftime_z="yes (assumed)"])])
if test "x$ob_cv_strftime_z" = x"no"; then
AC_MSG_ERROR([libc lacks necessary feature])
fi
---

Any ideas how to solve it?
TIA!