--- a/Makefile.in
+++ b/Makefile.in
@@ -36,7 +36,7 @@
 CXX = @CXX@
 CXXFLAGS = @CXXFLAGS@
 CPPFLAGS = @CPPFLAGS@
-LDFLAGS = @LDFLAGS@
+LDFLAGS = @LDFLAGS@ @PTHREAD_CFLAGS@
 
 ### Variables: ###