[CMake] Off-line builds with EXTERNALPROJECT_ADD

[fjdsamfsfd ivan]

Hi, 
I have CMakeLists.txt with several external projects included:

<...>EXTERNALPROJECT_ADD(    bzip2    URL http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz    CONFIGURE_COMMAND ""    BUILD_COMMAND make PREFIX=${CMAKE_BINARY_DIR} SHARED= XCFLAGS=-I${CMAKE_BINARY_DIR}/include XLDFLAGS=-L${CMAKE_BINARY_DIR}/lib XLIBS=-ldl    INSTALL_COMMAND make install PREFIX=${CMAKE_BINARY_DIR} SHARED=    BUILD_IN_SOURCE 1)
EXTERNALPROJECT_ADD(    expat    URL http://downloads.sourceforge.net/project/expat/expat/2.1.0/expat-2.1.0.tar.gz    CONFIGURE_COMMAND ./configure --prefix=${CMAKE_BINARY_DIR} --disable-shared --enable-static    BUILD_IN_SOURCE 1)

<...>

What I want to achieve is two step build process:
1) First command should perform download and patch steps only
2) Then I want to move prepared source tree to other machine and complete build with second command. Second machine is strictly off-line (for security reasons).

Can you help me with implementing such scenario? 		 	   		  
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