1 files changed, 16 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea0fa99..b129ef2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,7 +50,7 @@ endif()
 #
 # Check for unistd.h
 #
-check_include_file(unistd.h HAVE_UNISTD_H)
+check_include_file(unistd.h Z_HAVE_UNISTD_H)
 
 #
 # Check for errno.h
@@ -65,6 +65,21 @@ if(MSVC)
     add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
 endif()
 
+if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
+  # If we're doing an out of source build and the user has a zconf.h
+  # in their source tree...
+  if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h)
+     message(FATAL_ERROR "You must remove zconf.h from the source tree.  This f
+ile is generated by the ./configure script shipped with zlib.  CMake generates t
+his file for you automatically in the build directory")
+  endif()
+endif()
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.in
+               ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h @ONLY)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+
 #============================================================================
 # zlib
 #============================================================================
@@ -90,7 +105,6 @@ set(ZLIB_SRCS
     crc32.c
     deflate.c
     gzclose.c
-    gzio.c
     gzlib.c
     gzread.c
     gzwrite.c