autogen fails to build because its {,sig}setjmp(3) detection is broken:

checking whether setjmp() links okay... no
checking whether sigsetjmp() links okay... no
...
configure: error: AutoGen requires sigsetjmp(3)

The problem is that both functions want a sigjmp_buf, not a sigjmp_buf *.
Patch for ag_macros.m4 fixes this by passing bf instead of &bf twice.

I regenerated the other patch and fiddled with CONFIGURE_STYLE and
AUTOCONF_VERSION until it built. The completely incomprehensible error
messages on the way there always confuse me, so I hope someone who
understands this magic will be able to tell me how to do it right (or
commit a fixed version of the diff below).

With this fixed, devel/ti-msp430gcc packages.

Index: Makefile
===================================================================
RCS file: /cvs/ports/devel/autogen/Makefile,v
diff -u -p -r1.28 Makefile
--- Makefile	1 Nov 2025 11:16:41 -0000	1.28
+++ Makefile	3 Jun 2026 15:22:55 -0000
@@ -19,7 +19,9 @@ WANTLIB += c gmp guile iconv intl ltdl m
 LIB_DEPENDS=	devel/gettext,-runtime \
 		lang/guile \
 		textproc/libxml
-CONFIGURE_STYLE=gnu
+
+CONFIGURE_STYLE=	autoconf
+AUTOCONF_VERSION=	2.60
 
 CONFIGURE_ARGS=	--without-libregex \
 		--includedir=${PREFIX}/include/autogen
Index: patches/patch-agen5_test_error_test
===================================================================
RCS file: /cvs/ports/devel/autogen/patches/patch-agen5_test_error_test,v
diff -u -p -r1.2 patch-agen5_test_error_test
--- patches/patch-agen5_test_error_test	11 Mar 2022 18:49:41 -0000	1.2
+++ patches/patch-agen5_test_error_test	3 Jun 2026 15:07:15 -0000
@@ -1,9 +1,10 @@
 # Cope with the additional abort message (don't panic -- this test
 # intentionally checks abort behaviour).
 
---- agen5/test/error.test.orig	Sun Sep 24 04:11:15 2006
-+++ agen5/test/error.test	Fri Nov 17 20:15:03 2006
-@@ -103,6 +103,7 @@ AutoGen aborting on signal <text-varies>
+Index: agen5/test/error.test
+--- agen5/test/error.test.orig
++++ agen5/test/error.test
+@@ -103,6 +103,7 @@ AutoGen aborting on signal <text-varies> in state EMIT
  processing template error2.tpl
              on line 2
         for function EXPR (11)
Index: patches/patch-config_ag_macros_m4
===================================================================
RCS file: patches/patch-config_ag_macros_m4
diff -N patches/patch-config_ag_macros_m4
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-config_ag_macros_m4	3 Jun 2026 15:07:15 -0000
@@ -0,0 +1,21 @@
+Index: config/ag_macros.m4
+--- config/ag_macros.m4.orig
++++ config/ag_macros.m4
+@@ -78,7 +78,7 @@ AC_DEFUN([AG_LINK_SETJMP],[
+   AC_CACHE_VAL([ag_cv_link_setjmp],[
+   AC_TRY_LINK([@%:@include <setjmp.h>],
+     [jmp_buf bf;
+-return setjmp(&bf);],
++return setjmp(bf);],
+     [ag_cv_link_setjmp=yes],[ag_cv_link_setjmp=no]
+   ) # end of TRY_LINK
+   ]) # end of AC_CACHE_VAL for ag_cv_link_setjmp
+@@ -97,7 +97,7 @@ AC_DEFUN([AG_LINK_SIGSETJMP],[
+   AC_CACHE_VAL([ag_cv_link_sigsetjmp],[
+   AC_TRY_LINK([@%:@include <setjmp.h>],
+     [sigjmp_buf bf;
+-return sigsetjmp(&bf,0);],
++return sigsetjmp(bf,0);],
+     [ag_cv_link_sigsetjmp=yes],[ag_cv_link_sigsetjmp=no]
+   ) # end of TRY_LINK
+   ]) # end of AC_CACHE_VAL for ag_cv_link_sigsetjmp