math/taucs: Fix building with Flang and Clang 21

math/taucs/Makefile

@@ -55,7 +55,7 @@ archives: configure
 lib: archives
 	@${PRINTF} "\n\n%s\n\n\n" "Building shared library:"
 	(cd ${WRKSRC}_SHARED/lib/FreeBSD && \
-		${FC} ${CFLAGS} ${PICFLAG} ${LDFLAGS} -shared \
+		${CC} ${CFLAGS} ${PICFLAG} ${LDFLAGS} -shared \
 		-o libtaucs.so.1 -Wl,-x -Wl,-soname,libtaucs.so.1 \
 		-Wl,--whole-archive libtaucs.a -Wl,--no-whole-archive)
 	${STRIP_CMD} ${WRKSRC}_SHARED/lib/FreeBSD/libtaucs.so.1

math/taucs/files/patch-configurator_taucs__config.c

@@ -0,0 +1,13 @@
+https://github.com/sivantoledo/taucs/pull/2
+
+--- configurator/taucs_config.c.orig	2003-09-04 09:08:32 UTC
++++ configurator/taucs_config.c
+@@ -2,6 +2,8 @@
+ #include <stdlib.h>
+ #include <string.h>
+ 
++extern int mkdir();
++
+ #include "taucs_structure.h"
+ 
+ #define INPUT_LEN 1024