Fix:

error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
--- configure.orig	2024-09-30 16:47:50.000000000 -0500
+++ configure	2024-09-30 16:53:58.000000000 -0500
@@ -12346,7 +12346,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
  #include <stdio.h>
-             main ()
+             int main(void)
              {
                return 0;
              }
@@ -12387,7 +12387,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_octet s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12434,7 +12434,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_boolean s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12481,7 +12481,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_char s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12528,7 +12528,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_wchar s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12575,7 +12575,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_short s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12622,7 +12622,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_long s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12669,7 +12669,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_long_long s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12716,7 +12716,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_float s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12763,7 +12763,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_double s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12810,7 +12810,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_long_double s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12857,7 +12857,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_struct s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);
@@ -12904,7 +12904,7 @@
 			typedef struct {char s1;} CORBA_struct;
 			typedef void *CORBA_pointer;
 			struct test {char s1; CORBA_pointer s2;};
-			main()
+			int main(void)
 			{
 			FILE *f=fopen("conftestval", "w");
 			if (!f) exit(1);