Hi. I have some obsolete libgmp in /usr/lib, and the correct one in /usr/local/lib, but ghc does not find it, resp., finds the /usr/lib one earlier, and this is missing some symbols /usr/local/lib/ghc-7.10.3/integ_2aU3IZNMF9a7mQ0OzsZ0dS/libHSinteger-gmp-1.0.0.0-2aU3IZNMF9a7mQ0OzsZ0dS.a(wrappers.o): In function `integer_gmp_mpn_xor_n': wrappers.c:(.text+0x1761): undefined reference to `__gmpn_xor_n' when I put ghc ... -optl -Wl,--verbose I see that: SEARCH_DIR("/usr/i486-linux-gnu/lib32"); SEARCH_DIR("/usr/local/lib32"); SEARCH_DIR("/lib32"); SEARCH_DIR("/usr/lib32"); SEARCH_DIR("/usr/i486-linux-gnu/lib"); SEARCH_DIR("/usr/local/lib"); SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib"); but that's apparently not what's happening. Is ghc changing this, and how can I work around it? - J.W.