cmake: detect argp.h on osx

CMakeLists.txt

@@ -74,6 +74,10 @@ if (WITH_NACL)
     endif (NOT NACL_FOUND)
 endif (WITH_NACL)
 
+if (BSD OR SOLARIS OR OSX)
+    find_package(Argp)
+endif (BSD OR SOLARIS OR OSX)
+
 # config.h checks
 include(ConfigureChecks.cmake)
 configure_file(config.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config.h)

ConfigureChecks.cmake

@@ -47,7 +47,11 @@ int main(void){ return 0; }
 endif(CMAKE_COMPILER_IS_GNUCC AND NOT MINGW AND NOT OS2)
 
 # HEADER FILES
+set(CMAKE_REQUIRED_INCLUDES_SAVE ${CMAKE_REQUIRED_INCLUDES})
+set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${ARGP_INCLUDE_DIRS})
 check_include_file(argp.h HAVE_ARGP_H)
+set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES_SAVE})
+
 check_include_file(pty.h HAVE_PTY_H)
 check_include_file(utmp.h HAVE_UTMP_H)
 check_include_file(termios.h HAVE_TERMIOS_H)

examples/CMakeLists.txt

@@ -8,13 +8,10 @@ set(examples_SRCS
 
 include_directories(
   ${LIBSSH_PUBLIC_INCLUDE_DIRS}
+  ${ARGP_INCLUDE_DIRS}
   ${CMAKE_BINARY_DIR}
 )
 
-if (BSD OR SOLARIS OR OSX)
-    find_package(Argp)
-endif (BSD OR SOLARIS OR OSX)
-
 if (UNIX AND NOT WIN32)
     add_executable(libssh_scp libssh_scp.c ${examples_SRCS})
     target_link_libraries(libssh_scp ${LIBSSH_SHARED_LIBRARY})