opencv-1.1.0$ make
make  all-recursive
make[1]: Entering directory `/home/mercutio22/My-programs/opencv-1.1.0'
Making all in cxcore
make[2]: Entering directory `/home/mercutio22/My-programs/opencv-1.1.0/cxcore'
Making all in src
make[3]: Entering directory `/home/mercutio22/My-programs/opencv-1.1.0/cxcore/src'
/bin/bash ../../libtool --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I. -I../.. -I. -I../../cxcore/include -I../..  -DNDEBUG  -Wall -fno-rtti -pipe -O3 -g  -msse2  -fno-strict-aliasing -MT cxalloc.lo -MD -MP -MF .deps/cxalloc.Tpo -c -o cxalloc.lo cxalloc.cpp
 g++ -DHAVE_CONFIG_H -I. -I../.. -I. -I../../cxcore/include -I../.. -DNDEBUG -Wall -fno-rtti -pipe -O3 -g -msse2 -fno-strict-aliasing -MT cxalloc.lo -MD -MP -MF .deps/cxalloc.Tpo -c cxalloc.cpp  -fPIC -DPIC -o .libs/cxalloc.o
In file included from _cxcore.h:60,
                 from cxalloc.cpp:42:
../../cxcore/include/cxmisc.h:133:6: error: #elif with no expression
make[3]: *** [cxalloc.lo] Error 1
make[3]: Leaving directory `/home/mercutio22/My-programs/opencv-1.1.0/cxcore/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/mercutio22/My-programs/opencv-1.1.0/cxcore'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/mercutio22/My-programs/opencv-1.1.0'
make: *** [all] Error 2
mercutio22@debian:~/My-programs/opencv-1.1.0$




GCC 4.4 will introduce better checks in the preprocessor.  The problem
is pretty obvious: you're using a #elif without any condition when
you really want a #else.

You can reproduce this problem with gcc-snapshot from unstable.



correct:


remove: --- cxcore/include/cxmisc.h~    2008-11-07 15:12:58.000000000 +0000
add :   +++ cxcore/include/cxmisc.h 2008-11-07 15:13:03.000000000 +0000
 @@ -130,7 +130,7 @@
            #include <alloca.h>
         #elif defined HAVE_ALLOCA
           #include <stdlib.h>
remove:      -#elif
add:         +#else
               #error
             #endif