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# Often older version of flex is available in /usr. Even we set PATH for newer flex, CMake will set
# FLEX_INCLUDE_DIRS to /usr/include. This will result in compilation errors. Hence we check for flex
# include directory for the corresponding FLEX_EXECUTABLE. If found, we add that first and then we
# include include path from CMake.
get_filename_component(FLEX_BIN_DIR ${FLEX_EXECUTABLE} DIRECTORY)
if(NOT FLEX_BIN_DIR MATCHES "/usr/bin")
get_filename_component(FLEX_INCLUDE_PATH ${FLEX_BIN_DIR} PATH)
set(FLEX_INCLUDE_PATH ${FLEX_INCLUDE_PATH}/include/)
if(EXISTS "${FLEX_INCLUDE_PATH}/FlexLexer.h")
message(STATUS " Adding Flex include path as : ${FLEX_INCLUDE_PATH}")
include_directories(${FLEX_INCLUDE_PATH})
endif()
endif()
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