Dynamic X11 build broken since the configure move. Fix after Mark Hessling.

x11/configure

@@ -3799,7 +3799,9 @@ fi
 
 for ac_header in fcntl.h \
 	sys/time.h \
-	sys/select.h
+	sys/select.h \
+	dlfcn.h \
+	dl.h
 
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
@@ -4650,7 +4652,7 @@ if test "$DYN_COMP" = ""; then
 $as_echo_n "checking compiler flags for a dynamic object... " >&6; }
 
 cat > conftest.$ac_ext <<EOF
-#line 4653 "configure"
+#line 4655 "configure"
 int a=0
 EOF
 
@@ -4689,7 +4691,7 @@ $as_echo "none of $mh_cv_flags supported" >&6; }
 
 mh_compile='${CC-cc} -c $DYN_COMP conftest.$ac_ext 1>&5'
 cat > conftest.$ac_ext <<EOF
-#line 4692 "configure"
+#line 4694 "configure"
 int foo()
 {
 return(0);

x11/configure.ac

@@ -47,9 +47,12 @@ fi
 
 dnl Checks for libraries.
 
+dnl we check for dlfcn.h or dl.h so we know if we can build shared objects
 AC_CHECK_HEADERS(fcntl.h \
 	sys/time.h \
-	sys/select.h
+	sys/select.h \
+	dlfcn.h \
+	dl.h
 )
 
 dnl Checks for typedefs, structures, and compiler characteristics.