Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -1,8 +1,9 @@
 dnl
-dnl Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016, 2017
-dnl Jonathan Schleifer <js@heap.zone>
+dnl Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016, 2017,
+dnl               2018
+dnl   Jonathan Schleifer <js@heap.zone>
 dnl
 dnl https://heap.zone/git/?p=buildsys.git
 dnl
 dnl Permission to use, copy, modify, and/or distribute this software for any
 dnl purpose with or without fee is hereby granted, provided that the above
@@ -278,8 +279,11 @@
 				FRAMEWORK_LDFLAGS_INSTALL_NAME='-Wl,-install_name,@executable_path/../Frameworks/$$out/$${out%.framework}'
 			])
 
 			AC_SUBST(FRAMEWORK_LDFLAGS)
 			AC_SUBST(FRAMEWORK_LDFLAGS_INSTALL_NAME)
+
+			$1
+
 			;;
 	esac
 ])

Index: buildsys.mk.in
==================================================================
--- buildsys.mk.in
+++ buildsys.mk.in
@@ -1,9 +1,9 @@
 #
 #  Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
-#  2017
-#  Jonathan Schleifer <js@heap.zone>
+#                2017, 2018
+#    Jonathan Schleifer <js@heap.zone>
 #
 #  https://heap.zone/git/?p=buildsys.git
 #
 #  Permission to use, copy, modify, and/or distribute this software for any
 #  purpose with or without fee is hereby granted, provided that the above

Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -237,11 +237,10 @@
 AC_PROG_RANLIB
 AC_ARG_ENABLE(shared,
 	AS_HELP_STRING([--disable-shared], [do not build shared library]))
 AS_IF([test x"$enable_shared" != x"no"], [
 	BUILDSYS_SHARED_LIB
-	BUILDSYS_FRAMEWORK
 	AC_SUBST(OBJFW_SHARED_LIB, "${LIB_PREFIX}objfw${LIB_SUFFIX}")
 	AC_SUBST(EXCEPTIONS_LIB_A, "exceptions.lib.a")
 	AC_SUBST(EXCEPTIONS_EXCEPTIONS_LIB_A, "exceptions/exceptions.lib.a")
 	AC_SUBST(FORWARDING_LIB_A, "forwarding.lib.a")
 	AC_SUBST(FORWARDING_FORWARDING_LIB_A, "forwarding/forwarding.lib.a")
@@ -248,15 +247,13 @@
 	AC_SUBST(INVOCATION_LIB_A, "invocation.lib.a")
 	AC_SUBST(INVOCATION_INVOCATION_LIB_A, "invocation/invocation.lib.a")
 	AC_SUBST(LOOKUP_ASM_LIB_A, "lookup-asm.lib.a")
 	AC_SUBST(LOOKUP_ASM_LOOKUP_ASM_LIB_A, "lookup-asm/lookup-asm.lib.a")
 
-	case "$host_os" in
-		darwin*)
-			AC_SUBST(OBJFW_FRAMEWORK, "ObjFW.framework")
-			;;
-	esac
+	BUILDSYS_FRAMEWORK([
+		AC_SUBST(OBJFW_FRAMEWORK, "ObjFW.framework")
+	])
 ], [
 	AC_SUBST(LIBOBJFW_DEP, "../src/libobjfw.a")
 	AC_SUBST(LIBOBJFW_DEP_LVL2, "../../src/libobjfw.a")
 ])
 AC_ARG_ENABLE(static, AS_HELP_STRING([--enable-static], [build static library]))