--- a/src/mba/text.h
+++ b/src/mba/text.h
@@ -315,31 +315,6 @@
 /* "dumb" snprintf returns -1 on overflow */
 LIBMBA_API int dsnprintf(char *str, size_t size, const char *format, ...);
 
-#if !defined(_GNU_SOURCE)
-
-#if !defined(_BSD_SOURCE) && \
-	!defined(_XOPEN_SOURCE_EXTENDED) && \
-	!defined(_WIN32) && \
-	!(defined(__APPLE__) && defined(__MACH__))
-LIBMBA_API char *strdup(const char *s);
-#endif
-
-LIBMBA_API wchar_t *wcsdup(const wchar_t *s);
-LIBMBA_API size_t strnlen(const char *s, size_t maxlen);
-
-#if (__STDC_VERSION__ < 199901L) && \
-	!defined(_BSD_SOURCE) && \
-	(_XOPEN_VERSION < 500) && \
-	!(defined(__APPLE__) && defined(__MACH__))
-#include <stdarg.h>
-int vsnprintf(char *str, size_t size, const char *format, va_list ap);
-#endif
-
-LIBMBA_API size_t wcsnlen(const wchar_t *s, size_t maxlen);
-LIBMBA_API int wcscasecmp(const wchar_t *s1, const wchar_t *s2);
-
-#endif /* _GNU_SOURCE */
-
 /*
 wchar_t *wcschrnul(const wchar_t *s, wchar_t wc);
 int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);