ABI was not preserved between 1.7.0 and 1.9.0.

diff --git a/Makefile.am b/Makefile.am
index 50dfe11..4ccb52c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -37,7 +37,7 @@ if !HAVE_LIBGCRYPT
 lib_libiscsi_la_SOURCES += lib/md5.c
 endif
 
-SONAME=$(firstword $(subst ., ,$(VERSION)))
+SONAME=2
 SOREL=$(shell printf "%d%02d%02d" $(subst ., ,$(VERSION)))
 lib_libiscsi_la_LDFLAGS = \
 	-version-info $(SONAME):$(SOREL):0 -bindir $(bindir) -no-undefined \