iml in particular is very picky about being given an absolute path to…

… the

gmp.h for the version of GMP you want to use when building it

when passing --with-gmp-include it also requires a value for --with-gmp-lib;
for the vast majority of cases just replacing 'include' with 'lib' in the
include path should suffice; regardless it is less picky about this, especially
when using the system GMP (in which case it will be used naturally by the
linker via the standard library search path)

build/pkgs/iml/spkg-install

@@ -7,8 +7,15 @@ else
     export CFLAGS="-O3 -g $CFLAGS"
 fi
 
+# When using GMP from a standard system location it shouldn't really
+# matter what we put here, but iml's configure script requires we
+# provide *something*, and this should be reasonable in most cases
+SAGE_GMP_LIB="`echo "$SAGE_GMP_INCLUDE" | sed 's|/include|/lib|'`"
+
 sdh_configure --enable-shared \
               --with-default="$SAGE_LOCAL" \
+              --with-gmp-include="$SAGE_GMP_INCLUDE" \
+              --with-gmp-lib="$SAGE_GMP_LIB" \
               --with-cblas="$(pkg-config --libs cblas)" \
               --with-cblas-include="$(pkg-config --cflags cblas)" \
               "$IML_CONFIGURE"