Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -1,8 +1,8 @@
 dnl
 dnl Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016, 2017,
-dnl               2018, 2020
+dnl               2018, 2020, 2021
 dnl   Jonathan Schleifer <js@nil.im>
 dnl
 dnl https://fossil.nil.im/buildsys
 dnl
 dnl Permission to use, copy, modify, and/or distribute this software for any
@@ -165,12 +165,12 @@
 AC_DEFUN([BUILDSYS_SHARED_LIB], [
 	AC_REQUIRE([AC_CANONICAL_HOST])
 	AC_REQUIRE([BUILDSYS_CHECK_IOS])
 	AC_MSG_CHECKING(for shared library system)
 
-	case "$host_os" in
-	darwin*)
+	case "$host" in
+	*-*-darwin*)
 		AC_MSG_RESULT(Darwin)
 		LIB_CFLAGS='-fPIC -DPIC'
 		LIB_LDFLAGS='-dynamiclib -current_version ${LIB_MAJOR}.${LIB_MINOR} -compatibility_version ${LIB_MAJOR}'
 		LIB_LDFLAGS_INSTALL_NAME='-Wl,-install_name,${libdir}/$${out%.dylib}.${LIB_MAJOR}.dylib'
 		LIB_PREFIX='lib'
@@ -188,14 +188,14 @@
 		UNINSTALL_LIB='&& rm -f ${DESTDIR}${libdir}/$$i ${DESTDIR}${libdir}/$${i%.dylib}.${LIB_MAJOR}.dylib ${DESTDIR}${libdir}/$${i%.dylib}.${LIB_MAJOR}.${LIB_MINOR}.dylib'
 		INSTALL_PLUGIN='&& rm -fr ${DESTDIR}${plugindir}/$$i && cp -R $$i ${DESTDIR}${plugindir}/'
 		UNINSTALL_PLUGIN='&& rm -fr ${DESTDIR}${plugindir}/$$i'
 		CLEAN_LIB=''
 		;;
-	mingw* | cygwin*)
+	*-*-mingw* | *-*-cygwin*)
 		AC_MSG_RESULT(MinGW / Cygwin)
 		LIB_CFLAGS=''
-		LIB_LDFLAGS='-shared -Wl,--export-all-symbols,--out-implib,lib${SHARED_LIB}.a'
+		LIB_LDFLAGS='-shared -Wl,--export-all-symbols,--out-implib,lib$$out.a'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX=''
 		LIB_SUFFIX='.dll'
 		LDFLAGS_RPATH='-Wl,-rpath,${libdir}'
 		PLUGIN_CFLAGS=''
@@ -204,13 +204,13 @@
 		LINK_PLUGIN='${LD} -o $$out ${PLUGIN_OBJS} ${PLUGIN_OBJS_EXTRA} ${PLUGIN_LDFLAGS} ${LDFLAGS} ${LIBS}'
 		INSTALL_LIB='&& ${MKDIR_P} ${DESTDIR}${bindir} && ${INSTALL} -m 755 $$i ${DESTDIR}${bindir}/$$i && ${INSTALL} -m 755 lib$$i.a ${DESTDIR}${libdir}/lib$$i.a'
 		UNINSTALL_LIB='&& rm -f ${DESTDIR}${bindir}/$$i ${DESTDIR}${libdir}/lib$$i.a'
 		INSTALL_PLUGIN='&& ${INSTALL} -m 755 $$i ${DESTDIR}${plugindir}/$$i'
 		UNINSTALL_PLUGIN='&& rm -f ${DESTDIR}${plugindir}/$$i'
-		CLEAN_LIB='${SHARED_LIB}.a'
+		CLEAN_LIB='${SHARED_LIB}.a ${SHARED_LIB_NOINST}.a'
 		;;
-	openbsd* | mirbsd*)
+	*-*-openbsd* | *-*-mirbsd*)
 		AC_MSG_RESULT(OpenBSD)
 		LIB_CFLAGS='-fPIC -DPIC'
 		LIB_LDFLAGS='-shared'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX='lib'
@@ -224,14 +224,14 @@
 		UNINSTALL_LIB='&& rm -f ${DESTDIR}${libdir}/$$i'
 		INSTALL_PLUGIN='&& ${INSTALL} -m 755 $$i ${DESTDIR}${plugindir}/$$i'
 		UNINSTALL_PLUGIN='&& rm -f ${DESTDIR}${plugindir}/$$i'
 		CLEAN_LIB=''
 		;;
-	solaris*)
+	*-*-solaris*)
 		AC_MSG_RESULT(Solaris)
 		LIB_CFLAGS='-fPIC -DPIC'
-		LIB_LDFLAGS='-shared -Wl,-soname=${SHARED_LIB}.${LIB_MAJOR}.${LIB_MINOR}'
+		LIB_LDFLAGS='-shared -Wl,-soname=$$out.${LIB_MAJOR}.${LIB_MINOR}'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX='lib'
 		LIB_SUFFIX='.so'
 		LDFLAGS_RPATH='-Wl,-rpath,${libdir}'
 		PLUGIN_CFLAGS='-fPIC -DPIC'
@@ -242,14 +242,14 @@
 		UNINSTALL_LIB='&& rm -f ${DESTDIR}${libdir}/$$i ${DESTDIR}${libdir}/$$i.${LIB_MAJOR}.${LIB_MINOR}'
 		INSTALL_PLUGIN='&& ${INSTALL} -m 755 $$i ${DESTDIR}${plugindir}/$$i'
 		UNINSTALL_PLUGIN='&& rm -f ${DESTDIR}${plugindir}/$$i'
 		CLEAN_LIB=''
 		;;
-	*-android*)
+	*-*-android*)
 		AC_MSG_RESULT(Android)
 		LIB_CFLAGS='-fPIC -DPIC'
-		LIB_LDFLAGS='-shared -Wl,-soname=${SHARED_LIB}.${LIB_MAJOR}'
+		LIB_LDFLAGS='-shared -Wl,-soname=$$out.${LIB_MAJOR}'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX='lib'
 		LIB_SUFFIX='.so'
 		LDFLAGS_RPATH=''
 		PLUGIN_CFLAGS='-fPIC -DPIC'
@@ -260,14 +260,33 @@
 		UNINSTALL_LIB='&& rm -f ${DESTDIR}${libdir}/$$i ${DESTDIR}${libdir}/$$i.${LIB_MAJOR} ${DESTDIR}${libdir}/$$i.${LIB_MAJOR}.${LIB_MINOR}.0'
 		INSTALL_PLUGIN='&& ${INSTALL} -m 755 $$i ${DESTDIR}${plugindir}/$$i'
 		UNINSTALL_PLUGIN='&& rm -f ${DESTDIR}${plugindir}/$$i'
 		CLEAN_LIB=''
 		;;
+	hppa*-*-hpux*)
+		AC_MSG_RESULT([HP-UX (PA-RISC)])
+		LIB_CFLAGS='-fPIC -DPIC'
+		LIB_LDFLAGS='-shared -Wl,+h,$$out'
+		LIB_LDFLAGS_INSTALL_NAME=''
+		LIB_PREFIX='lib'
+		LIB_SUFFIX='.${LIB_MAJOR}'
+		LINK_LIB='&& ln -s $$out $${out%%.*}.sl'
+		LDFLAGS_RPATH='-Wl,+b,${libdir}'
+		PLUGIN_CFLAGS='-fPIC -DPIC'
+		PLUGIN_LDFLAGS='-shared'
+		PLUGIN_SUFFIX='.sl'
+		LINK_PLUGIN='${LD} -o $$out ${PLUGIN_OBJS} ${PLUGIN_OBJS_EXTRA} ${PLUGIN_LDFLAGS} ${LDFLAGS} ${LIBS}'
+		INSTALL_LIB='&& ${INSTALL} -m 755 $$i ${DESTDIR}${libdir}/$$i && ${LN_S} -f $$i ${DESTDIR}${libdir}/$${i%%.*}.sl'
+		UNINSTALL_LIB='&& rm -f ${DESTDIR}${libdir}/$$i ${DESTDIR}${libdir}/$${i%%.*}.sl'
+		INSTALL_PLUGIN='&& ${INSTALL} -m 755 $$i ${DESTDIR}${plugindir}/$$i'
+		UNINSTALL_PLUGIN='&& rm -f ${DESTDIR}${plugindir}/$$i'
+		CLEAN_LIB=''
+		;;
 	*)
 		AC_MSG_RESULT(ELF)
 		LIB_CFLAGS='-fPIC -DPIC'
-		LIB_LDFLAGS='-shared -Wl,-soname=${SHARED_LIB}.${LIB_MAJOR}'
+		LIB_LDFLAGS='-shared -Wl,-soname=$$out.${LIB_MAJOR}'
 		LIB_LDFLAGS_INSTALL_NAME=''
 		LIB_PREFIX='lib'
 		LIB_SUFFIX='.so'
 		LDFLAGS_RPATH='-Wl,-rpath,${libdir}'
 		PLUGIN_CFLAGS='-fPIC -DPIC'
@@ -285,10 +304,11 @@
 	AC_SUBST(LIB_CFLAGS)
 	AC_SUBST(LIB_LDFLAGS)
 	AC_SUBST(LIB_LDFLAGS_INSTALL_NAME)
 	AC_SUBST(LIB_PREFIX)
 	AC_SUBST(LIB_SUFFIX)
+	AC_SUBST(LINK_LIB)
 	AC_SUBST(LDFLAGS_RPATH)
 	AC_SUBST(PLUGIN_CFLAGS)
 	AC_SUBST(PLUGIN_LDFLAGS)
 	AC_SUBST(PLUGIN_SUFFIX)
 	AC_SUBST(LINK_PLUGIN)

Index: buildsys.mk.in
==================================================================
--- buildsys.mk.in
+++ buildsys.mk.in
@@ -1,8 +1,8 @@
 #
 #  Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
-#                2017, 2018, 2020
+#                2017, 2018, 2020, 2021
 #    Jonathan Schleifer <js@nil.im>
 #
 #  https://fossil.nil.im/buildsys
 #
 #  Permission to use, copy, modify, and/or distribute this software for any
@@ -54,10 +54,11 @@
 LIB_CFLAGS = @LIB_CFLAGS@
 LIB_LDFLAGS = @LIB_LDFLAGS@
 LIB_LDFLAGS_INSTALL_NAME = @LIB_LDFLAGS_INSTALL_NAME@
 LIB_PREFIX = @LIB_PREFIX@
 LIB_SUFFIX = @LIB_SUFFIX@
+LINK_LIB = @LINK_LIB@
 AMIGA_LIB_CFLAGS = @AMIGA_LIB_CFLAGS@
 AMIGA_LIB_LDFLAGS = @AMIGA_LIB_LDFLAGS@
 PLUGIN_CFLAGS = @PLUGIN_CFLAGS@
 PLUGIN_LDFLAGS = @PLUGIN_LDFLAGS@
 PLUGIN_SUFFIX = @PLUGIN_SUFFIX@
@@ -181,11 +182,11 @@
 	fi
 
 ${SHARED_LIB} ${SHARED_LIB_NOINST}: ${EXT_DEPS} ${LIB_OBJS} ${LIB_OBJS_EXTRA}
 	${LINK_STATUS}
 	out="$@"; \
-	if ${LD} -o $@ ${LIB_OBJS} ${LIB_OBJS_EXTRA} ${LIB_LDFLAGS} ${LIB_LDFLAGS_INSTALL_NAME} ${LDFLAGS} ${LIBS}; then \
+	if ${LD} -o $@ ${LIB_OBJS} ${LIB_OBJS_EXTRA} ${LIB_LDFLAGS} ${LIB_LDFLAGS_INSTALL_NAME} ${LDFLAGS} ${LIBS} ${LINK_LIB}; then \
 		${LINK_OK}; \
 	else \
 		${LINK_FAILED}; \
 	fi