diff --git a/configure b/configure
index 756952b96..84f85f28c 100755
--- a/configure
+++ b/configure
@@ -4160,7 +4160,11 @@ tar xfz pthreads.tar.gz
 cd threads/src
 ./configure
 cd ../../../
+if test "$ac_cv_pthreadspecial"!=no; then
 PTHREAD_CFLAGS="-I=../extras/threads/include $ac_cv_pthreadspecial"
+else
+PTHREAD_CFLAGS="-I=../extras/threads/include"
+fi
 PTHREAD_LIBS="../extras/lib/libgthreads.a ../extras/lib/libmalloc.a"
 fi
 fi
@@ -4186,12 +4190,12 @@ CC="$PTHREAD_CC"
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 IRCDLIBS="$IRCDLIBS $PTHREAD_LIBS"
 echo $ac_n "checking if FD_SETSIZE is large enough to allow $ac_fd file descriptors""... $ac_c" 1>&6
-echo "configure:4190: checking if FD_SETSIZE is large enough to allow $ac_fd file descriptors" >&5
+echo "configure:4194: checking if FD_SETSIZE is large enough to allow $ac_fd file descriptors" >&5
 if test "$cross_compiling" = yes; then
     { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
 else
   cat > conftest.$ac_ext <<EOF
-#line 4195 "configure"
+#line 4199 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -4203,7 +4207,7 @@ exit(1);
 }
 
 EOF
-if { (eval echo configure:4207: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:4211: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   echo "$ac_t""yes" 1>&6
 else