initial upload

doc/GMT/GMTConfig.cmake

@@ -0,0 +1,23 @@
+macro(set_and_check _var _file)
+  set(${_var} "${_file}")
+  if(NOT EXISTS "${_file}")
+    message(FATAL_ERROR "File or directory ${_file} referenced by variable ${_var} does not exist !")
+  endif()
+endmacro()
+
+# change the following options as needed
+set(GMT_VERSION "6.0.0")
+
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Darwin")
+  set_and_check(GMT_INC_DIR "/opt/homebrew/include")
+  set_and_check(GMT_LIB_DIR "/opt/homebrew/lib")
+
+elseif(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
+  set_and_check(GMT_INC_DIR "/usr/include")
+  set_and_check(GMT_LIB_DIR "/usr/lib/x86_64-linux-gnu")
+
+else()
+  message(FATAL_ERROR "Unset operation system for GMT. Please edit the GMTConfig.cmake file.")
+endif()
+
+set(GMT_LIB gmt)