An abbreviated background to this build error?

[NormW]

G/E;
Building for NetWare after 3+ months elsewhere, an get the following 
build error:
Creating Build Helper gen_test_char.exe
### mwld.exe Linker Error:
#   Undefined symbol: _isascii in
#      gen_test_char.obj
### mwcc Driver Error:
#   linker 'D:\CWCMDL40\mwld.exe' returned with exit code 1
AFAICT NetWare  doesn't have the leading '_'.
Norm