gcj: error trying to exec 'ecj1': execvp

Hi All,

I recently installed the newest gcj 4.4 (see
http://gcc.gnu.org/ml/java/2009-03/msg00028.html) and I am trying to
compile a awt/swing project.

As I have an older version of gcj (4.2) installed on the system, I
call gcj with its complete path and I updated LD_LIBRARY_PATH such as

$ echo $LD_LIBRARY_PATH
:/usr/local/lib/:/local/gcc-4_4-branch/install/lib/

So I'm trying to compile foo.java into its object file foo.o like so:

$ /local/gcc-4_4-branch/install/bin/gcj -O0 -g0 -v  -c foo.java -o foo.o
Using built-in specs.
Reading specs from
/local/gcc-4_4-branch/install/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../libgcj.spec
rename spec startfile to startfileorig
rename spec lib to liborig
Target: i686-pc-linux-gnu
Configured with:
/home/micd/gcc-4_4-branch/obj-x86_64-unknown-linux-gnu/../configure
--enable-languages=java --prefix=/local/gcc-4_4-branch/install
--enable-java-home --enable-java-awt=gtk
Thread model: posix
gcc version 4.4.0 20090331 (prerelease) (GCC)
COLLECT_GCC_OPTIONS='-fsaw-java-file' '-O0' '-g0' '-v' '-c' '-o'
'foo.o' '-fbootclasspath=./:/local/gcc-4_4-branch/install/share/java/libgcj-4.4.0.jar'
'-shared-libgcc' '-mtune=generic'
 ecj1 foo.java -g0
-fbootclasspath=./:/local/gcc-4_4-branch/install/share/java/libgcj-4.4.0.jar
-g0 -fsource=1.5 -ftarget=1.5 -fzip-dependency /tmp/cc3BLQiG.zip
-fzip-target /tmp/ccQkVPqc.jar
gcj: error trying to exec 'ecj1': execvp: No such file or directory

How can I solve this ? Isn't ecj a reference to the Eclipse java
compiler (what is it doing with gcc) ? and what is execvp ?

Many thanks in advance for your help!

David