#230 error: use of undeclared identifier 'CLOCK_MONOTONIC'

[Ryan Carsten Schmidt]

xfe 1.42 builds fine on macOS 10.12 but fails to build on OS X 10.11 and earlier with:

../st/st.c:979:3: warning: implicit declaration of function 'clock_gettime' is invalid in C99 [-Wimplicit-function-declaration]
                clock_gettime(CLOCK_MONOTONIC, &now);
                ^
../st/st.c:979:17: error: use of undeclared identifier 'CLOCK_MONOTONIC'
                clock_gettime(CLOCK_MONOTONIC, &now);
                              ^
../st/st.c:4032:16: error: use of undeclared identifier 'CLOCK_MONOTONIC'
        clock_gettime(CLOCK_MONOTONIC, &last);
                      ^
../st/st.c:4057:17: error: use of undeclared identifier 'CLOCK_MONOTONIC'
                clock_gettime(CLOCK_MONOTONIC, &now);
                              ^
1 warning and 3 errors generated.
make[2]: *** [../st/st.o] Error 1

Here's a full build log:

https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/14410/steps/install-port/logs/stdio

[Roland Baudin]

I managed to install MaOSX in a virtual machine, but how do you compile Xfe in this system? Do you have some instructions to share?
Thanks.

[J G Miller]

I got this error when compiling with gcc-13 (on openSUSE Leap 15.6) using C standard "c11"

On invoking gcc-13 with -std=gnu11, this error did not arise.

It seems that gnu11 pulls in some extra defines that are not included with just c11.