zlib cmake error

[mercury20160104]

(1)
CMake Warning (dev) at CMakeLists.txt:44 (set):
implicitly converting 'Force change of path' to 'STRING' type.
This warning is for project developers. Use -Wno-dev to suppress it.
(2)

……
Looking for unistd.h - not found
CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/adler32.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/compress.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/crc32.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/deflate.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/gzclose.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/gzlib.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/gzread.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/gzwrite.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inflate.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/infback.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inftrees.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inffast.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/trees.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/uncompr.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/zutil.c

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/win32/zlib1.rc

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/crc32.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/deflate.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/gzguts.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inffast.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inffixed.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inflate.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/inftrees.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/trees.h

Invalid character escape '\3'.

CMake Error at zlib/CMakeLists.txt:169 (add_library):
Syntax error in cmake code when parsing string

C:\3rdparty\zlib/zutil.h

Invalid character escape '\3'.

Configuring incomplete, errors occurred!
See also "D:/OSG/osg-3rdparty-cmake/build/CMakeFiles/CMakeOutput.log".
See also "D:/OSG/osg-3rdparty-cmake/build/CMakeFiles/CMakeError.log".

[Björn Blissing]

@mercury20160104 It looks like you have forced a windows backslash character \ into the path, since your path string begins with C:\3rdparty\.

Try using a forward slashes instead, i.e. /