configure: Check for a potential -lpthread by using -ldl

Some pthread library variants depend on libdl, hence we must pass such a
library to successfully build against libpthread.

diff --git a/configure.ac b/configure.ac
index 6874832e1bcd44304d5e1780b10bd9e6a35d6e4e..daabdd782b96216a252e023883fc55c557939d2f 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -486,7 +486,7 @@ AC_SEARCH_LIBS(socket, socket, [SOCKLIB=$LIBS],
 AC_SUBST(SOCKLIB)
 
 # Android has pthread_* functions in bionic (libc), others need libpthread
-LIBS=""
+LIBS=$DLLIB
 AC_SEARCH_LIBS(pthread_create, pthread, [PTHREADLIB=$LIBS])
 AC_SUBST(PTHREADLIB)