Hello! Today I tried to build latest gcc trunk (rev #158628) and got the following errors: libbackend.a(builtins.o): In function `fold_builtin_ccos': /home/salmin/gcc-trunk/host-x86_64-unknown-linux-gnu/gcc/../.././gcc/builtins.c:7341: undefined reference to `mpc_cosh' /home/salmin/gcc-trunk/host-x86_64-unknown-linux-gnu/gcc/../.././gcc/builtins.c:7341: undefined reference to `mpc_cos' libbackend.a(builtins.o): In function `fold_builtin_cexp': /home/salmin/gcc-trunk/host-x86_64-unknown-linux-gnu/gcc/../.././gcc/builtins.c:7434: undefined reference to `mpc_exp' .... which is surprising because I have libmpc installed (debian sid): salmin@salmin:~/gcc-trunk$ dpkg -l libmpc* | grep ^ii | grep -v libmpcdec ii libmpc-dev 0.8.1-1 multiple precision complex floating-point library development package ii libmpc2 0.8.1-1 multiple precision complex floating-point library configuring with LDFLAGS=-lmpc solved the problem. Is it a bug in Makefile or something or I'm doing it wrong? Alexey