tar zxvf systemcams-1.0.tar.gz
make CC="clang -fgnu89-inline"
configure script ignores environmental variable CFLAGS, so -fgnu89-inline option must be specified during make.
BackgroundClang assumes .c file as a C99 source code. Some C program assumes its language is C89 with gnu extension (aka gnu89).
gnu89 and C99 have several differences. The biggest one is a function with 'extern inline'.
In gnu89, functions with 'extern inline' are not necessarily compiled to normal non-inlined function.
In C99, such functions must be also compiled to a normal non-inlined function.
Source code which is expected to be compiled with gnu89 may cause link error of multiple definitions for this case.
If you use inline function in C, use 'static inline'. Its meaning is same for both C99 and gnu89.