configure: socketpair needs -lsocket on Solaris.
diff --git a/configure.ac b/configure.ac
index fe40d1e..6a60c9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1482,7 +1482,6 @@
 	sigaltstack \
 	sigprocmask \
 	snprintf \
-	socketpair \
 	spawnvp \
 	statfs \
 	statvfs \
@@ -1536,6 +1535,7 @@
 	getservbyport \
 	inet_network \
 	sendmsg \
+	socketpair \
 )
 
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