Add c99 compilation option to targets + add explicit python include

CMakeLists.txt

@@ -25,6 +25,12 @@ set(LTFATPY_DIR "${CMAKE_SOURCE_DIR}/ltfatpy")
 set(CKERNEL_DIR "${LTFATPY_SOURCE_DIR}/ltfat_C_kernel")
 set(DOC_DIR "${LTFATPY_SOURCE_DIR}/doc")
 
+##### Find Python
+find_package( PythonLibs 3 REQUIRED )
+find_package( PythonInterp 3 REQUIRED )
+include_directories( ${PYTHON_INCLUDE_DIRS} )
+message("PYTHON INCLUDES : ${PYTHON_INCLUDE_DIRS}")
+
 #### Find FFTW
 find_package(FFTW REQUIRED)
 message ("FFTW found")

ltfat_C_kernel/CMakeLists.txt

@@ -20,12 +20,14 @@ add_library(ltfatf STATIC ${SRC} ${SRC_BLASLAPACK})
 target_link_libraries(ltfatf ${FFTW_LIBRARIES} ${FFTWF_LIBRARIES} 
 ${LAPACK_LIBRARIES} ${CMAKE_EXE_LINKER_FLAGS})
 target_compile_definitions(ltfatf PUBLIC LTFAT_SINGLE)
+set_property(TARGET ltfatf PROPERTY C_STANDARD 99)
 install(TARGETS ltfatf ARCHIVE DESTINATION ${CKERNEL_DIR}/lib)
 
 add_library(ltfat STATIC ${SRC} ${SRC_BLASLAPACK} ${SRC_NOTYPECHANGE})
 target_link_libraries(ltfat ${FFTW_LIBRARIES} ${FFTWF_LIBRARIES} 
 ${LAPACK_LIBRARIES} ${CMAKE_EXE_LINKER_FLAGS})
 target_compile_definitions(ltfat PUBLIC LTFAT_DOUBLE)
+set_property(TARGET ltfat PROPERTY C_STANDARD 99)
 install(TARGETS ltfat ARCHIVE DESTINATION ${CKERNEL_DIR}/lib)
 
 #add_subdirectory(tests)