Hi, The configure script is broken for gcc 4.0, and will incorrectly report that gcc is unable to produce PIC shared libraries, or use the -o option, among other things.
The problem is that CPPFLAGS is defined before the libtool checks are performed, and that CPPFLAGS contains references to Makefile variables which are then passed as is to gcc. ---- 8< snip ---- configure:13304: checking if i486-linux-gnu-gcc PIC flag -fPIC works configure:13322: i486-linux-gnu-gcc -c -g -O2 -W -Wall -Wcast-align -Wcast-qual -Wmissing-declarations -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wstrict-prot\ otypes -pedantic -ansi -DPATH_SANE_CONFIG_DIR=$(configdir) -DPATH_SANE_DATA_DIR=$(datadir) -DPATH_SANE_LOCK_DIR=$(localstatedir) -DV_MAJOR=1 -\ DV_MINOR=0 -I/usr/include/gphoto2 -fPIC -DPIC conftest.c >&5 <command line>:1:22: warning: '$' in identifier or number configure:13326: $? = 0 configure:13337: result: no ---- 8< snip ---- The fix would be to either undefine CPPFLAGS when libtool runs its checks, or run the libtool checks before setting CPPFLAGS. I went for the quick solution and modified CPPFLAGS before the libtool checks (which might not be the best solution). ---- 8< snip ---- dnl *********************************************************************** dnl initialize libtool dnl *********************************************************************** brokenCPPFLAGS="$CPPFLAGS" CPPFLAGS="" AC_LIBTOOL_WIN32_DLL AC_DISABLE_STATIC AC_PROG_LIBTOOL CPPFLAGS="$brokenCPPFLAGS" ---- 8< snip ---- Until this is fixed, sane-backends is broken on each and every system using gcc 4.0 and a non-i386 CPU (which do not tolerate shared libraries built without -fPIC). JB. -- Julien BLACHE <http://www.jblache.org> <j...@jblache.org> GPG KeyID 0xF5D65169