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+
+   Configuring the Build System
+   Update: 04 May 2006
+
+
+  1. Overview
+  
+  The "configure" script in pjproject root directory is not an autoconf script,
+but it's just a custom script to generate "build.mak" for the build system. 
+The "build.mak" file declares the following global Makefile variables:
+
+  MACHINE_NAME
+    The processor and hardware platform of the target. For each MACHINE_NAME,
+    there must be matching "m-*.mak" entry in "build/" subdirectory. For 
+    example, when MACHINE_NAME is declared as "i386", then there must be 
+    "m-i386.mak" file in "build/" subdirectory.
+  
+  OS_NAME
+    Operating system name, determines which "os-*.mak" in "build/" dir to use.
+
+  HOST_NAME
+     Build host name, determines which "host-*.mak" to use.
+
+  CC_NAME
+     Compiler name, determines which "cc-*.mak" to use.
+
+  TARGET_NAME
+     Determines suffix to be added to output files (for example,
+     "libpjsip-i386-linux-gcc.a"). The value normally is equal to
+     $(MACHINE_NAME)-$(OS_NAME)-$(CC_NAME), but it can contain any value.
+  
+  CROSS_COMPILE
+     Determine the prefix to be applied when invoking build tools (for
+     example, "powerpc-rtems-"). The default is empty.
+
+
+  At present, the configure script CAN NOT be used for configuring cross
+compilation. For cross compiling, you must create the "build.mak" file
+manually.
+
+
+  2. Supported Hosts and Targets
+
+  The number of supported hosts and targets will (hopefully) increase over time.
+See "build/" subdirectory for list of supported machines, OSes, hosts, and
+compilers.
+