Same magic as haubi did for glib compilation, which works again here
resolving a linker problem on Solaris with GNU ld.  Bug #222625

--- a/pr/src/Makefile.in
+++ b/pr/src/Makefile.in
@@ -95,7 +95,7 @@
 endif
 
 ifdef USE_PTHREADS
-OS_LIBS			= -lpthread ${LIBRT} -lsocket -lnsl -ldl -lc
+OS_LIBS			= -pthread ${LIBRT} -lsocket -lnsl -ldl -lc
 else
 ifdef LOCAL_THREADS_ONLY
 OS_LIBS			= -lsocket -lnsl -ldl -lc