diff -r adb27ed2f421 crypto/Makefile
--- a/crypto/Makefile	Fri Aug 21 17:32:41 2009 -0700
+++ b/crypto/Makefile	Mon Aug 24 00:09:43 2009 +0200
@@ -39,12 +39,23 @@
 stage_dir=../dist/stage
 
 sdkdir ?= ${MOZSDKDIR}
+
+# If blank, try to use pkg-config
+# To add a path to pkg-config search path, use PKG_CONFIG_PATH
+# (see man pkg-config)
+ifeq ($(sdkdir),)
+	sdkdir = $(shell pkg-config --variable sdkdir libxul)
+endif
+
 ifeq ($(sdkdir),)
   $(warning No 'sdkdir' variable given)
   $(warning It should point to the location of the Gecko SDK)
   $(warning For example: "make sdkdir=/foo/bar/baz")
   $(warning Or set the MOZSDKDIR environment variable to point to it)
+  $(warning Or fix your xulrunner pkg-config files)
   $(error)
+else
+  $(info Using Mozilla SDKDIR as: ${sdkdir})
 endif
 
 all: build
diff -r adb27ed2f421 crypto/src/Makefile
--- a/crypto/src/Makefile	Fri Aug 21 17:32:41 2009 -0700
+++ b/crypto/src/Makefile	Mon Aug 24 00:09:43 2009 +0200
@@ -37,9 +37,17 @@
 #
 # ***** END LICENSE BLOCK *****
 
+# Define some custom pkg-config functions
+pkg-config-var	= $(shell pkg-config --variable $(1) $(2))
+pkg-config-I	= $(shell pkg-config --cflags-only-I $(1) $(2))
+pkg-config-l	= $(patsubst -l%,%,$(shell pkg-config --libs-only-l $(1)))
+pkg-config-L	= $(patsubst -L%,%,$(shell pkg-config --libs-only-L $(1)))
+
+# Actually use pkg-config?
+pkgconfig = "no"
+
 # OS detection
 
-xpidl = $(sdkdir)/bin/xpidl
 link = link
 
 sys := $(shell uname -s)
@@ -48,7 +56,6 @@
 ifeq ($(wince), 1)
   os = WINNT
   cxx = $(sdkdir)/sdk/bin/arm-wince-gcc
-  xpidl = $(sdkdir)/host/bin/host_xpidl
   link = $(sdkdir)/sdk/bin/arm-wince-link
   so = dll
 else
@@ -165,13 +172,24 @@
 destdir = ..
 platformdir = $(destdir)/platform/$(platform)
 
+# If blank, try to use pkg-config
+# To add a path to pkg-config search path, use PKG_CONFIG_PATH
+# (see man pkg-config)
+ifeq ($(sdkdir),)
+  pkgconfig="yes"
+  sdkdir = $(call pkg-config-var,sdkdir,libxul)
+endif
+
 # FIXME: we don't actually require this for e.g. clean
 ifeq ($(sdkdir),)
   $(warning No 'sdkdir' variable given)
   $(warning It should point to the location of the Gecko SDK)
   $(warning For example: "make sdkdir=/foo/bar/baz")
   $(warning Or set the MOZSDKDIR environment variable to point to it)
+  $(warning Or fix your xulrunner pkg-config files)
   $(error )
+else
+  $(info Using Mozilla SDKDIR as: ${sdkdir})
 endif
 
 idl_headers = $(idl:.idl=.h)
@@ -179,30 +197,75 @@
 cpp_objects = $(cpp_sources:.cpp=.o)
 so_target = $(target:=.$(so))
 
-headers = -I$(sdkdir)/include \
-          -I$(sdkdir)/include/system_wrappers \
-          -I$(sdkdir)/include/nss \
-          -I$(sdkdir)/include/xpcom \
-          -I$(sdkdir)/include/string \
-          -I$(sdkdir)/include/pipnss \
-          -I$(sdkdir)/include/nspr \
-          -I$(sdkdir)/sdk/include
+xpidl = $(sdkdir)/bin/xpidl
+ifeq ($(wince), 1)
+  xpidl = $(sdkdir)/host/bin/host_xpidl
+endif
+
+ifeq ($(pkgconfig),"yes")
+  # Include dirs
+  nss_includes    = $(call pkg-config-I,nss)
+  nspr_includes   = $(call pkg-config-I,nspr)
+  libxul_includes = $(call pkg-config-I,libxul)
+
+  # Library dirs
+  nss_libdirs     = $(call pkg-config-L,nss)
+  nspr_libdirs    = $(call pkg-config-L,nspr)
+  libxul_libdirs  = $(call pkg-config-L,libxul)
+
+  # Libs
+  nss_libs        = $(call pkg-config-l,nss)
+  nspr_libs       = $(call pkg-config-l,nspr)
+  libxul_libs     = $(call pkg-config-l,libxul)
+
+  idl_dir         = $(call pkg-config-var,idldir,libxul)
+
+# Fallback to Hard-coded
+else
+  # Include dirs
+  nss_includes    = -I$(sdkdir)/include/nss
+  nspr_includes   = -I$(sdkdir)/include/nspr
+  libxul_includes = -I$(sdkdir)/include \
+                    -I$(sdkdir)/include/system_wrappers \
+                    -I$(sdkdir)/include/xpcom \
+                    -I$(sdkdir)/include/string \
+                    -I$(sdkdir)/include/pipnss \
+                    -I$(sdkdir)/sdk/include
+
+  # Library dirs
+  libxul_libdirs  = $(sdkdir)/lib $(sdkdir)/bin
+  nss_libdirs     = $(libxul_libdirs)
+  nspr_libdirs    = $(libxul_libdirs)
+
+  # Libs
+  nss_libs        = ssl3 smime3 nss3 nssutil3
+  nspr_libs       = nspr4 plds4 plc4
+  libxul_libs     = xpcomglue_s
+  ifeq ($(wince),1)
+    libxul_libs = $(libxul_libs) xpcom
+  else
+    libxul_libs = $(libxul_libs) xpcomglue
+  endif
+
+  ifeq ($(os), linux)
+	  libxul_libs = $(libxul_libs) xpcom_core
+  endif
+
+  idl_dir         = $(sdkdir)/idl
+endif
+
+headers = $(nss_includes) \
+          $(nspr_includes) \
+          $(libxul_includes)
 
 # libraries
-libdirs := $(sdkdir)/lib $(sdkdir)/bin
-ifeq ($(wince),1)
-libs := xpcomglue_s xpcom nspr4 \
-        crmf smime3 ssl3 nss3 nssutil3 \
-        plds4 plc4
-else
-libs := xpcomglue xpcomglue_s nspr4 \
-        crmf smime3 ssl3 nss3 nssutil3 \
-        plds4 plc4
-endif
+libdirs = $(nss_libdirs) \
+          $(nspr_libdirs) \
+          $(libxul_libdirs)
 
-ifeq ($(os), Linux)
-  libs := xpcom_core $(libs)
-endif
+libs = $(nss_libs) \
+       $(nspr_libs) \
+       $(libxul_libs)
 
 # compiler and Linker Flags
 
@@ -328,10 +391,10 @@
 
 # rules to build the c headers and .xpt from idl
 $(idl_headers): $(idl)
-	$(xpidl) -m header -I$(sdkdir)/idl $(@:.h=.idl)
+	$(xpidl) -m header -I$(idl_dir) $(@:.h=.idl)
 
 $(idl_typelib): $(idl)
-	$(xpidl) -m typelib -I$(sdkdir)/idl $(@:.xpt=.idl)
+	$(xpidl) -m typelib -I$(idl_dir) $(@:.xpt=.idl)
 
 # build and link rules
 ifeq ($(os), Darwin)