Dear developers, I am using the following configure for M4: env PATH=/ufs/goncalve/scratch/MonetDB/buildtools/bin:/ufs/goncalve/scratch/MonetDB/clients:/ufs/goncalve/scratch/MonetDB/MonetDB/bin:${PATH} PYTHONPATH=/ufs/goncalve/MonetDB/buildtools/autogen/ ~/MonetDB/MonetDB4/MonetDB4/configure --prefix=/ufs/goncalve/scratch/MonetDB/monetdb4 --enable-debug --enable-bits=64 However, the compilation gave this error: -c embeddedclient.c -fPIC -DPIC -o .libs/libembeddedmil_la-embeddedclient.o In file included from /ufs/goncalve/MonetDB/MonetDB4/MonetDB4/src/tools/embeddedclient.mx:69: embeddedclient.h:29:18: error: Mapi.h: No such file or directory I already add to the PATH the prefix for the clients installation. What more I need to add to the path? Why the configure of M4 does not complain about such missing? Regards, Romulo