fix build

Summary: add missing ssl dep

Test Plan: build it

Reviewed By: dcsommer@fb.com

Subscribers: doug, njormrod, folly-diffs@

FB internal diff: D1652234

Signature: t1:1652234:1414778507:4504ea06c3076e0cdfa7772166cf48bc564c9076

folly/Makefile.am

@@ -322,7 +322,7 @@ endif
 libfollybase_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(LT_VERSION)
 
 libfolly_la_LIBADD = libfollybase.la
-libfolly_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(LT_VERSION)
+libfolly_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(LT_VERSION) -lssl
 
 FingerprintTables.cpp: generate_fingerprint_tables
 	./generate_fingerprint_tables

folly/configure.ac

@@ -58,6 +58,11 @@ AC_CHECK_LIB([glog],[openlog],[],[AC_MSG_ERROR(
 AC_CHECK_LIB([gflags],[getenv],[],[AC_MSG_ERROR(
              [Please install google-gflags library])])
 
+AC_CHECK_LIB(ssl,
+        SSL_ctrl,
+        [],
+        [AC_MSG_ERROR(["Error: libssl required"])])
+
 # check for boost libs
 AX_BOOST_BASE([1.20.0], [], [AC_MSG_ERROR(
               [Please install boost >= 1.20.0 (thread, regex, and system)])])