+# --with-libpthread {{{
+AC_ARG_WITH(libpthread, [AS_HELP_STRING([--with-libpthread=@<:@=PREFIX@:>@], [Path to libpthread.])],
+[ if test "x$withval" != "xno" \
+ && test "x$withval" != "xyes"
+ then
+ LDFLAGS="$LDFLAGS -L$withval/lib"
+ CPPFLAGS="$CPPFLAGS -I$withval/include"
+ with_libpthread="yes"
+ else
+ if test "x$withval" = "xno"
+ then
+ with_libpthread="no (disabled)"
+ fi
+ fi
+], [with_libpthread="yes"])
+
+AC_SUBST([PTHREAD_LIBS])
+if test "x$with_libpthread" = "xyes"
+then
+ SAVE_LIBS="$LIBS"
+ AC_CHECK_LIB(pthread, pthread_create, [], [with_libpthread="no (Symbol 'pthread_create' not found)"], [])
+ PTHREAD_LIBS="$LIBS"
+ LIBS="$SAVE_LIBS"
+fi
+
+if test "x$with_libpthread" = "xyes"
+then
+ AC_CHECK_HEADERS(pthread.h,, [with_libpthread="no (pthread.h not found)"])
+fi
+if test "x$with_libpthread" = "xyes"
+then
+ collect_pthread=1
+else
+ collect_pthread=0
+fi
+AC_DEFINE_UNQUOTED(HAVE_LIBPTHREAD, [$collect_pthread],
+ [Wether or not to use pthread (POSIX threads) library])
+AM_CONDITIONAL(BUILD_WITH_LIBPTHREAD, test "x$with_libpthread" = "xyes")
+# }}}
+