When making under Slackware Linux using gcc 2.95.3, I get the
OXTaskBar.cc: In method `void
implicit declaration of function `int isblank(...)'
To fix this i had to add "-D_USE_ISOC99" as a compilation
flag. isblank() is declared inside of header file ctype.h. My version of
ctype.h wraps the definition of isblank() with "#ifdef
I don't know if there is an elegant fix, but
the above worked for me.