Köszönöm, végül ez lett a megoldás, ilyesmi:
sed 's/(\*times)\[0\] = sb->st_atim;/(*times)[0].tv_sec = sb->st_atim.tv_sec;(*times)[0].tv_nsec = sb->st_atim.tv_nsec;/
s/(\*times)\[1\] = sb->st_mtim;/(*times)[1].tv_sec = sb->st_mtim.tv_sec;(*times)[1].tv_nsec = sb->st_mtim.tv_nsec;/
' src/filemanager/file.c.orig >src/filemanager/file.c