diff -ruN grace-5.1.25-orig/configure grace-5.1.25/configure
--- grace-5.1.25-orig/configure	2015-02-14 16:59:46.000000000 -0600
+++ grace-5.1.25/configure	2021-04-16 04:44:02.000000000 -0500
@@ -4236,6 +4236,7 @@
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
+#include <stdlib.h>
 
     int main(void) {
       static int Array[3];
@@ -4934,6 +4935,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -7802,6 +7804,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <string.h>
 #include <t1lib.h>
       int main(void) {
@@ -8345,6 +8348,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <string.h>
 #include <zlib.h>
       int main(void) {
@@ -8430,6 +8434,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <jpeglib.h>
       int main(void) {
@@ -8515,6 +8520,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <string.h>
 #include <png.h>
       int main(void) {
@@ -8602,6 +8608,8 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <string.h>
+#include <stdlib.h>
 #include <pdflib.h>
       int main(void) {
         char *vinc;
@@ -9552,7 +9560,9 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#include <stdlib.h>
 #include <Xm/XmAll.h>
+void XmRegisterConverters(void);
       int main(void) {
         int vlibn, vincn;
         vincn = XmVersion;