diff --git a/mail/postfix/files/patch-makedefs b/mail/postfix/files/patch-makedefs
new file mode 100644
--- /dev/null
+++ b/mail/postfix/files/patch-makedefs
@@ -0,0 +1,18 @@
+--- makedefs.orig	2023-04-14 13:37:45 UTC
++++ makedefs
+@@ -343,6 +343,15 @@ case "$SYSTEM.$RELEASE" in
+ 		: ${SHLIB_ENV="LD_LIBRARY_PATH=`pwd`/lib"}
+ 		: ${PLUGIN_LD="${CC} -shared"}
+ 		;;
++   FreeBSD.15*)	SYSTYPE=FREEBSD15
++		: ${CC=cc}
++		: ${SHLIB_SUFFIX=.so}
++		: ${SHLIB_CFLAGS=-fPIC}
++		: ${SHLIB_LD="${CC} -shared"' -Wl,-soname,${LIB}'}
++		: ${SHLIB_RPATH='-Wl,-rpath,${SHLIB_DIR}'}
++		: ${SHLIB_ENV="LD_LIBRARY_PATH=`pwd`/lib"}
++		: ${PLUGIN_LD="${CC} -shared"}
++		;;
+  DragonFly.*)	SYSTYPE=DRAGONFLY
+ 		;;
+   OpenBSD.2*)	SYSTYPE=OPENBSD2
diff --git a/mail/postfix/files/patch-src_util_sys__defs.h b/mail/postfix/files/patch-src_util_sys__defs.h
new file mode 100644
--- /dev/null
+++ b/mail/postfix/files/patch-src_util_sys__defs.h
@@ -0,0 +1,11 @@
+--- src/util/sys_defs.h.orig	2023-02-13 19:36:27 UTC
++++ src/util/sys_defs.h
+@@ -31,7 +31,7 @@
+     || defined(FREEBSD5) || defined(FREEBSD6) || defined(FREEBSD7) \
+     || defined(FREEBSD8) || defined(FREEBSD9) || defined(FREEBSD10) \
+     || defined(FREEBSD11) || defined(FREEBSD12) || defined(FREEBSD13) \
+-    || defined(FREEBSD14) \
++    || defined(FREEBSD14) || defined(FREEBSD15) \
+     || defined(BSDI2) || defined(BSDI3) || defined(BSDI4) \
+     || defined(OPENBSD2) || defined(OPENBSD3) || defined(OPENBSD4) \
+     || defined(OPENBSD5) || defined(OPENBSD6) || defined(OPENBSD7) \