make report an error as below:
“fontconfig-2.12.1/src/fcmatch.c:324:63: error: ‘PRI_CHAR_WIDTH_STRONG’ undeclared here (not in a function); did you mean ‘PRI_WIDTH_STRONG’?”

"fontconfig-2.12.1/src/fcmatch.c:324:63: error: ‘PRI_CHAR_WIDTH_STRONG' undeclared here (not in a function); did you mean ‘PRI_WIDTH_STRONG’?"

Solution:
Enter the source code directory. My path is
1.
fontconfig-2.12.1/fontconfig/fontconfig.h
Found #define FC_CHAR_WIDTH “charwidth” /* Int / deleted
Add #define FC_CHARWIDTH “charwidth” / Int */
#define FC_CHAR_WIDTH FC_CHARWIDTH
2.
fontconfig-2.12.1/src/fcobjs.h
Find FC_OBJECT (CHAR_WIDTH, FcTypeInteger, NULL) and delete it.
Add FC_OBJECT (CHARWIDTH, FcTypeInteger, NULL)
3.
fontconfig-2.12.1/src/fcobjshash.gperf
Find “CHARWIDTH”, FC_CHAR_WIDTH_OBJECT and delete it.
Add “charwidth”,FC_CHARWIDTH_OBJECT
4.
fontconfig-2.12.1/src/fcobjshash.h
Find {(int)(long)&((struct FcObjectTypeNamePool_t *)0)->FcObjectTypeNamePool_str45,FC_CHAR_WIDTH_OBJECT}, delete
add {(int)(long)&((struct FcObjectTypeNamePool_t *)0)->FcObjectTypeNamePool_str45,FC_CHARWIDTH_OBJECT},
End, make && make install successful
is to modify and replace a few macro definitions, you can happily edit cairo!
Although the high version of fontconfig does not have this error, but the cross-compiler reported that the other failed to solve