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-rw-r--r--termios.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/termios.h b/termios.h
index 6c46202..ee9bbce 100644
--- a/termios.h
+++ b/termios.h
@@ -48,6 +48,14 @@ SOFTWARE.
# define _POSIX_SOURCE
#endif
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 19901L
+# if (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 200112L)
+# error POSIX.1-2001 and later require a C99 compiler
+# elif (defined _XOPEN_SOURCE && _XOPEN_SOURCE >= 600)
+# error XOPEN Issue 6 and later require a C99 compiler
+# endif
+#endif
+
#if (defined _POSIX_SOURCE)
/* ./src/termios/B0.c */
#define B0 (0)