diff --git a/calma/CalmaWrite.c b/calma/CalmaWrite.c
index 600bfb66..b4a7da63 100644
--- a/calma/CalmaWrite.c
+++ b/calma/CalmaWrite.c
@@ -28,9 +28,8 @@ static char rcsid[] __attribute__ ((unused)) ="$Header: /usr/cvsroot/magic-8.0/c
 #include <ctype.h>
 #include <sys/types.h>
 #include <arpa/inet.h>	/* for htons() */
-#if defined(SYSV) || defined(EMSCRIPTEN)
-#include <time.h>
-#else
+#include <time.h>       /* since C89 */
+#ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
 
@@ -164,9 +163,6 @@ HashTable calmaLibHash;
 HashTable calmaPrefixHash;
 HashTable calmaUndefHash;
 
-/* Imports */
-extern time_t time();
-
 
 /* -------------------------------------------------------------------- */
 
diff --git a/scripts/configure.in b/scripts/configure.in
index befde369..704c6080 100644
--- a/scripts/configure.in
+++ b/scripts/configure.in
@@ -150,6 +150,9 @@ AC_CHECK_HEADERS(param.h)
 dnl Check for <paths.h>
 AC_CHECK_HEADERS(paths.h)
 
+dnl Check for <sys/time.h>
+AC_CHECK_HEADERS(sys/time.h)
+
 dnl Check for va_copy
 AC_CACHE_CHECK([for va_copy], ac_cv_c_va_copy,
  AC_TRY_LINK(