Update cmake to use env vars

Should work with brew

CMakeLists.txt

@@ -1,9 +1,15 @@
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8)
 project(catimg)
 
 set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
 
-# set soem options
+if (DEFINED ENV{man1})
+ set(INSTALL_MAN $ENV{man1})
+else()
+ set(INSTALL_MAN "/share/man/man1")
+endif()
+
+# set some options
 #set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wall -Wextra -g -std=c99 -Wno-unused-result")
 #set(CMAKE_BUILD_TYPE Debug)
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Wall -Wextra -Os -std=c99 -Wno-unused-result")
@@ -28,12 +34,12 @@ add_executable(
 install(TARGETS catimg
  RUNTIME DESTINATION bin)
 
-# libs
-target_link_libraries(catimg m)
-
 # man page
 install(FILES ${PROJECT_SOURCE_DIR}/man/catimg.1
- DESTINATION share/man/man1)
+ DESTINATION ${INSTALL_MAN})
+
+# libs
+target_link_libraries(catimg m)
 
 # tests
 #enable_testing()