Use JAVA_HOME to find Java on macOS.
Install files into CMAKE_INSTALL_PREFIX not /usr.
Treat MacPorts build type as Release.
Don't force -stdlib=libc++ on macOS. MacPorts will set the right lib to use.
--- CMakeLists.txt.orig	2018-01-11 11:18:20.000000000 -0600
+++ CMakeLists.txt	2018-11-12 17:13:35.000000000 -0600
@@ -38,7 +38,7 @@
 # and the Java Development Kit 'include' directories added
 if(BUILD_JAVA_LIBS)
     set(BUILD_SHARED_LIBS ON)
-    if(WIN32)
+    if(WIN32 OR APPLE)
         set(java_home $ENV{JAVA_HOME})
         if(NOT java_home)
             message(FATAL_ERROR "Environment variable JAVA_HOME not defined")
@@ -58,7 +58,7 @@
 if(BUILD_SHARED_LIBS OR BUILD_STATIC_LIBS)
     add_library(astyle ${SRCS})
     if(NOT WIN32)
-        install(TARGETS astyle DESTINATION /usr/lib)
+        install(TARGETS astyle DESTINATION lib)
     endif()
 else()
     add_executable(astyle ${SRCS})
@@ -71,8 +71,8 @@
         install(TARGETS astyle DESTINATION ${prog_files}/AStyle)
         install(FILES ${DOCS} DESTINATION ${prog_files}/AStyle/doc/)
     else()
-        install(TARGETS astyle DESTINATION /usr/bin)
-        install(FILES ${DOCS} DESTINATION /usr/share/doc/astyle)
+        install(TARGETS astyle DESTINATION bin)
+        install(FILES ${DOCS} DESTINATION share/doc/astyle)
     endif()
 endif()
 
@@ -83,6 +83,9 @@
         if(WIN32)
             target_include_directories(astyle PRIVATE $ENV{JAVA_HOME}/include)
             target_include_directories(astyle PRIVATE $ENV{JAVA_HOME}/include/win32)
+        elseif(APPLE)
+            target_include_directories(astyle PRIVATE $ENV{JAVA_HOME}/include)
+            target_include_directories(astyle PRIVATE $ENV{JAVA_HOME}/include/darwin)
         else()
             target_include_directories(astyle PRIVATE /usr/lib/jvm/default-java/include)
             target_include_directories(astyle PRIVATE /usr/lib/jvm/default-java/include/linux)
@@ -123,7 +126,7 @@
 
 macro(set_linker_options strip_option)
     # Remove -rdynamic and add 'strip' to linker flags
-    if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")
+    if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "MinSizeRel" OR CMAKE_BUILD_TYPE STREQUAL "MacPorts")
         set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
         set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS} ${strip_option}")
         set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${strip_option}")
@@ -146,7 +149,7 @@
 # Set default compile options for supported compilers
 if(APPLE)
     target_compile_options(
-        astyle PRIVATE -W -Wall -fno-rtti -fno-exceptions -std=c++11 -stdlib=libc++)
+        astyle PRIVATE -W -Wall -fno-rtti -fno-exceptions -std=c++11)
     set_linker_options("")
 elseif(NOT WIN32)   # Linux
     target_compile_options(astyle PRIVATE -Wall -fno-rtti -fno-exceptions -std=c++11)