configure: Check for functions and headers that we use

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/configure.ac b/configure.ac
index 15127165ca50cfc8ca225c74fb31ea44b5bd9333..ad051e32e068a61c1965af2d6c98d761cef81bc4 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -113,15 +113,19 @@ AC_CHECK_LIB([m], [round])
 
 AC_CHECK_HEADERS([ \
        assert.h \
+       ctypes.h \
        math.h \
+       stdarg.h \
        stdlib.h \
        string.h \
+       syslog.h \
        sys/stat.h \
        unistd.h
 ])
 
 AC_CHECK_FUNCS([ \
        assert \
+       secure_getenv \
        strcmp \
        strdup
 ])