Dont define the detect rules on autoconf builds, otherwise ac builds is

painfully slow.

config/Linux.mk

@@ -35,10 +35,16 @@ endif
 endif
 GFX_ARCH		:= x
 
+# Dont do the detect hackery for autoconf builds.  It makes them painfully
+# slow and its not needed anyway, since autoconf does it much better.
+ifndef USE_AUTOCONF
+
 # Include the automagically generated makefile.  This generated makefile
 # should contain lots of magic paths and flags.
 -include $(MOZILLA_DETECT_GEN)
 
+endif # USE_AUTOCONF
+
 OS_INCLUDES		= $(MOZILLA_XFE_MOTIF_INCLUDE_FLAGS) $(MOZILLA_XFE_X11_INCLUDE_FLAGS)
 G++INCLUDES		= -I/usr/include/g++
 LOC_LIB_DIR		= /usr/lib/X11

config/rules.mk

@@ -798,12 +798,18 @@ $(MKDEPEND)::
 	cd $(DEPTH)/config; $(MAKE) nsinstall tweak_nspr
 	cd $(MKDEPEND_DIR); $(MAKE)
 
+# Dont do the detect hackery for autoconf builds.  It makes them painfully
+# slow and its not needed anyway, since autoconf does it much better.
+ifndef USE_AUTOCONF
+
 # Rules to for detection
 $(MOZILLA_DETECT_GEN):
 	cd $(MOZILLA_DETECT_DIR); $(MAKE)
 
 detect: $(MOZILLA_DETECT_GEN)
 
+endif
+
 ifdef OBJS
 depend:: $(MKDEPEND) $(MKDEPENDENCIES)
 else