OpenSolaris needs libsocket and libnsl for socket().

configure.in

@@ -850,7 +850,7 @@ dnl libraries needed on some platforms but not on others
 dnl ====================================================
 saved_LIBS=$LIBS
 
-dnl FreeBSD has dlopen integrated in libc, Linux needs libdl
+dnl FreeBSD and Mac OS X have dlopen integrated in libc, Linux needs libdl
 LIBS=""
 AC_SEARCH_LIBS(dlopen, dl, [DLLIB=$LIBS])
 AC_SUBST(DLLIB)
@@ -861,6 +861,13 @@ AC_SEARCH_LIBS(backtrace, execinfo, [BTLIB=$LIBS])
 AC_CHECK_FUNCS(backtrace)
 AC_SUBST(BTLIB)
 
+dnl OpenSolaris needs libsocket and libnsl for socket()
+LIBS=""
+AC_SEARCH_LIBS(socket, socket, [SOCKLIB=$LIBS],
+	[AC_CHECK_LIB(nsl, socket, [SOCKLIB="-lsocket -lnsl"], [], [-lsocket])]
+)
+AC_SUBST(SOCKLIB)
+
 LIBS=$saved_LIBS
 dnl ======================
 

src/charon/Makefile.am

@@ -108,7 +108,7 @@ AM_CFLAGS = -rdynamic \
   -DIPSEC_PIDDIR=\"${piddir}\" \
   -DIPSEC_PLUGINDIR=\"${plugindir}\" \
   -DSTRONGSWAN_CONF=\"${strongswan_conf}\"
-charon_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la -lpthread -lm $(DLLIB)
+charon_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la -lpthread -lm $(DLLIB) $(SOCKLIB)
 
 # compile options
 #################

src/libstrongswan/Makefile.am

@@ -50,7 +50,7 @@ utils/mutex.c utils/mutex.h \
 utils/backtrace.c utils/backtrace.h \
 plugins/plugin_loader.c plugins/plugin_loader.h plugins/plugin.h
 
-libstrongswan_la_LIBADD = -lpthread $(DLLIB) $(BTLIB)
+libstrongswan_la_LIBADD = -lpthread $(DLLIB) $(BTLIB) $(SOCKLIB)
 
 INCLUDES = -I$(top_srcdir)/src/libstrongswan
 AM_CFLAGS = \

src/starter/Makefile.am

@@ -20,7 +20,7 @@ AM_CFLAGS = \
 -DIPSEC_EAPDIR=\"${eapdir}\" \
 -DDEBUG
 
-starter_LDADD = defs.o $(top_builddir)/src/libfreeswan/libfreeswan.a $(top_builddir)/src/libstrongswan/libstrongswan.la
+starter_LDADD = defs.o $(top_builddir)/src/libfreeswan/libfreeswan.a $(top_builddir)/src/libstrongswan/libstrongswan.la $(SOCKLIB)
 EXTRA_DIST = parser.l parser.y keywords.txt ipsec.conf
 dist_man_MANS = ipsec.conf.5 starter.8
 MAINTAINERCLEANFILES = lex.yy.c y.tab.c y.tab.h keywords.c

src/stroke/Makefile.am

@@ -1,6 +1,7 @@
 ipsec_PROGRAMS = stroke
 
 stroke_SOURCES = stroke.c stroke_msg.h stroke_keywords.c stroke_keywords.h
+stroke_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la $(SOCKLIB)
 INCLUDES = -I$(top_srcdir)/src/libstrongswan
 EXTRA_DIST = stroke_keywords.txt
 BUILT_SOURCES = stroke_keywords.c