Cannot build sapnwrfc for monitoring SAP

Hi,

I’m trying to build the sapnwrfc python module shipped with check_mk so I can monitor a SAP system. I’ve installed the nwrfc750P development kit from SAP in /usr/sap. However when I try to build the python module I get the following error:

python3 setup.py build
running build
running build_py
running build_ext
In my own BUILD_EXTENSIONS...

building 'nwsaprfcutil' extension
rm -rf build/temp.linux-x86_64-3.6
creating build/temp.linux-x86_64-3.6
creating build/temp.linux-x86_64-3.6/src
gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -D_LARGEFILE_SOURCE -DSAPwithUNICODE -DSAPonUNIX -D__NO_MATH_INLINES -DSAPwithTHREADS -I/usr/sap/nwrfcsdk/include -I/usr/include/python3.6m -c src/nwsaprfcutil.c -o build/temp.linux-x86_64-3.6/src/nwsaprfcutil.o -E -mno-3dnow -fno-strict-aliasing -pipe -fexceptions -funsigned-char -Wall -Wno-uninitialized -Wno-long-long -Wcast-align -fPIC
In file included from /usr/sap/nwrfcsdk/include/sapnwrfc.h:7:0,
                 from src/nwsaprfcutil.c:35:
/usr/sap/nwrfcsdk/include/sapucrfc.h:1255:26: error: pasting "u" and ""RFC ERR %s: %s\n"" does not give a valid preprocessing token
   #define cU16_HELP(par) u##par
                          ^
/usr/sap/nwrfcsdk/include/sapucrfc.h:1235:24: note: in expansion of macro ‘cU16_HELP’
 #define cU16(par)      cU16_HELP(par) /* if par is a macro, it must be ...    */
                        ^
/usr/sap/nwrfcsdk/include/sapucrfc.h:1231:25: note: in expansion of macro ‘cU16’
 #define cU(par)         cU16(par)
                         ^
src/nwsaprfcutil.c:497:22: note: in expansion of macro ‘cU’
     fprintfU(stderr, cU("RFC ERR %s: %s\n"), errorInfo.key, errorInfo.message);
                      ^
/usr/sap/nwrfcsdk/include/sapucrfc.h:1255:26: error: pasting "u" and ""RfcDestroyFunction: %d - %s - %s\n"" does not give a valid preprocessing token
   #define cU16_HELP(par) u##par
                          ^
/usr/sap/nwrfcsdk/include/sapucrfc.h:1235:24: note: in expansion of macro ‘cU16_HELP’
 #define cU16(par)      cU16_HELP(par) /* if par is a macro, it must be ...    */
                        ^
/usr/sap/nwrfcsdk/include/sapucrfc.h:1231:25: note: in expansion of macro ‘cU16’
 #define cU(par)         cU16(par)
                         ^
src/nwsaprfcutil.c:737:22: note: in expansion of macro ‘cU’
     fprintfU(stderr, cU("RfcDestroyFunction: %d - %s - %s\n"),
                      ^
error: command 'gcc' failed with exit status 1

Has anyone been able to build this module? I also tried building using python2 but that gives the same result. This is on a RHEL7 system.