https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121246
--- Comment #2 from Fred J. Tydeman <tydeman at tybor dot com> --- OK. Have installed that package. This simple program (test183.c): /* Done: dnf install libdfp_devel */ #define __STDC_WANT_DEC_FP__ 1 #define __STDC_WANT_IEC_60559_DFP_EXT__ 1 #include <dfp/math.h> #include <math.h> int main(void){ return 0; } Gets (via: gcc test183.c) In file included from test183.c:5: /usr/include/dfp/math.h:36:23: error: no include path in which to search for math.h 36 | #include_next <math.h> | ^ /usr/include/dfp/math.h:90:10: fatal error: bits/dfp_dmathcalls.h: No such file or directory 90 | #include <bits/dfp_dmathcalls.h> | ^~~~~~~~~~~~~~~~~~~~~~~ compilation terminated.