test=doprntf.c:128 GNU MP assertion failed: (p-)conv == 1 && p->prec ... I would be grateful if some other GMP developer could help with this. The bug is for real, to reproduce configure with --enable-assert. I haven't analysed if the ASSERT is wrong, or if it is a more serious issue. All relevant code is a few lines in printf/doprntf.c. -- Torbjörn