Arduino: 1.8.8 (Mac OS X), Board: "XYZZY Test Board"

/Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/hardware -hardware /Users/russm/Library/Arduino15/packages -hardware /Users/russm/Documents/Arduino/hardware -tools /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/tools-builder -tools /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/russm/Library/Arduino15/packages -built-in-libraries /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/libraries -libraries /Users/russm/Documents/Arduino/libraries -fqbn=xyzzy:esp8266:xyzzy -ide-version=10808 -build-path /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_build_906739 -warnings=none -build-cache /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_cache_595771 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.esptool.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/esptool/2.5.0-3-20ed2b9 -prefs=runtime.tools.esptool-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/esptool/2.5.0-3-20ed2b9 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9 -prefs=runtime.tools.xtensa-lx106-elf-gcc-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9 -prefs=runtime.tools.mkspiffs.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-3-20ed2b9 -prefs=runtime.tools.mkspiffs-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-3-20ed2b9 -verbose /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/untitled114449657.tmp/sketch_dec28a/sketch_dec28a.ino
/Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/hardware -hardware /Users/russm/Library/Arduino15/packages -hardware /Users/russm/Documents/Arduino/hardware -tools /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/tools-builder -tools /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/hardware/tools/avr -tools /Users/russm/Library/Arduino15/packages -built-in-libraries /Volumes/arduino-1.8.8-macosx/Arduino.app/Contents/Java/libraries -libraries /Users/russm/Documents/Arduino/libraries -fqbn=xyzzy:esp8266:xyzzy -ide-version=10808 -build-path /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_build_906739 -warnings=none -build-cache /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_cache_595771 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.esptool.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/esptool/2.5.0-3-20ed2b9 -prefs=runtime.tools.esptool-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/esptool/2.5.0-3-20ed2b9 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9 -prefs=runtime.tools.xtensa-lx106-elf-gcc-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9 -prefs=runtime.tools.mkspiffs.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-3-20ed2b9 -prefs=runtime.tools.mkspiffs-2.5.0-3-20ed2b9.path=/Users/russm/Library/Arduino15/packages/esp8266/tools/mkspiffs/2.5.0-3-20ed2b9 -verbose /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/untitled114449657.tmp/sketch_dec28a/sketch_dec28a.ino
Using board 'xyzzy' from platform in folder: /Users/russm/Documents/Arduino/hardware/xyzzy/esp8266
Using core 'esp8266' from platform in folder: /Users/russm/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.0-beta2
Detecting libraries used...
/Users/russm/Library/Arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/bin/xtensa-lx106-elf-g++ -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ -I/Users/russm/Documents/Arduino/hardware/xyzzy/esp8266/tools/sdk/include -I/Users/russm/Documents/Arduino/hardware/xyzzy/esp8266/tools/sdk/lwip/include -I/Users/russm/Documents/Arduino/hardware/xyzzy/esp8266/tools/sdk/libc/xtensa-lx106-elf/include -I/var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_build_906739/core -c -w -Os -g -mlongcalls -mtext-section-literals -fno-rtti -falign-functions=4 -std=c++11 -ffunction-sections -fdata-sections -fexceptions -w -x c++ -E -CC -DF_CPU=80000000L -DLWIP_OPEN_SRC -DARDUINO=10808 -DARDUINO_ESP8266_XYZZY -DARDUINO_ARCH_ESP8266 "-DARDUINO_BOARD=\"ESP8266_XYZZY\"" -DESP8266 -I/Users/russm/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.0-beta2/cores/esp8266 -I/Users/russm/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.0-beta2/variants/generic /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_build_906739/sketch/sketch_dec28a.ino.cpp -o /dev/null
In file included from /Users/russm/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.0-beta2/cores/esp8266/Arduino.h:38:0,
                 from /var/folders/27/7lp3n0qd5tz73n5wnygpc5580000gp/T/arduino_build_906739/sketch/sketch_dec28a.ino.cpp:1:
/Users/russm/Library/Arduino15/packages/esp8266/hardware/esp8266/2.5.0-beta2/cores/esp8266/esp8266_peri.h:24:21: fatal error: c_types.h: No such file or directory
 #include "c_types.h"
                     ^
compilation terminated.
exit status 1
Error compiling for board XYZZY Test Board.