Problem building Javaconnect

Hi, this is my .mozconfig file:

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. $topsrcdir/xulrunner/config/mozconfig
CC=gcc
CXX=g++
CPP=cpp
AS=as
LD=ld
ac_add_options --disable-accessibility
ac_add_options --disable-activex
ac_add_options --enable-extensions=default,java
ac_add_options 
--with-java-include-path=C:/Programmi/Java/jdk1.5.0_05/include
ac_add_options --with-java-bin-path=C:/Programmi/Java/jdk1.5.0_05/bin

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Anyway it seems there is an error in the file:
mozilla/extensions/java/xpcom/nsJavaInterfaces.cpp
because when I run the compilation, after long time I get this error:

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...
...
make[6]: Entering directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src'
nsJavaInterfaces.cpp
Building deps for 
/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src/../nsJavaInterfaces.cpp
/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/build/cygwin-wrapper 
g++ -mno-cygwin -o nsJavaInterfaces.o -c  -DMOZILLA_INTERNAL_API 
-D_IMPL_NS_COM -DEXPORT_XPT_API -DEXPORT_XPTC_API 
-D_IMPL_NS_COM_OBSOLETE -D_IMPL_NS_GFX -D_IMPL_NS_WIDGET -DIMPL_XULAPI 
-DIMPL_NS_NET  -DZLIB_INTERNAL -DOSTYPE=\"WINNT5.1\" -DOSARCH=\"WINNT\" 
-DBUILD_ID=0000000000 -IC:/Programmi/Java/jdk1.5.0_05/include 
-IC:/Programmi/Java/jdk1.5.0_05/include/win32 
-I/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src 
-I../../../../dist/include/xpcom -I../../../../dist/include/string 
-I../../../../dist/include/xulapp -I../../../../dist/include/javaxpcom 
-I../../../../dist/include -I../../../../dist/include/nspr 
-I../../../../dist/sdk/include       -fno-rtti -fno-exceptions -Wall 
-Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth 
-Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wno-long-long -pedantic 
-mms-bitfields -pipe  -DNDEBUG -DTRIMMED -O   -DX_DISPLAY_MISSING=1 
-DMOZILLA_VERSION=\"1.9a1\" -DMOZILLA_VERSION_U=1.9a1 -DHAVE_SNPRINTF=1 
-D_WINDOWS=1 -D_WIN32=1 -DWIN32=1 -DXP_WIN=1 -DXP_WIN32=1 -DHW_THREADS=1 
-DWINVER=0x400 -D_WIN32_WINNT=0x400 -DSTDC_HEADERS=1 
-DWIN32_LEAN_AND_MEAN=1 -DNO_X11=1 -D_X86_=1 -DD_INO=d_ino 
-DSTDC_HEADERS=1 -Duid_t=int -Dgid_t=int -DHAVE_DIRENT_H=1 
-DHAVE_GETOPT_H=1 -DHAVE_MEMORY_H=1 -DHAVE_UNISTD_H=1 -DHAVE_MALLOC_H=1 
-DHAVE_LIBM=1 -DNO_X11=1 -DMMAP_MISSES_WRITES=1 -DHAVE_STRERROR=1 
-DHAVE_SNPRINTF=1 -DHAVE_MEMMOVE=1 -DHAVE_RINT=1 -DVA_COPY=va_copy 
-DHAVE_VA_COPY=1 -DMOZ_DEFAULT_TOOLKIT=\"windows\" -DMOZ_XULRUNNER=1 
-DMOZ_BUILD_APP=xulrunner -DMOZ_XUL_APP=1 
-DMOZ_DISTRIBUTION_ID=\"org.mozilla\" -DOJI=1 -DIBMBIDI=1 
-DMOZ_VIEW_SOURCE=1 -DMOZ_XPINSTALL=1 -DMOZ_JSLOADER=1 -DNS_PRINTING=1 
-DNS_PRINT_PREVIEW=1 -DMOZ_XTF=1 -DMOZ_MATHML=1 
-DMOZ_UPDATE_CHANNEL=default -DMOZ_LOGGING=1 -DHAVE___CXA_DEMANGLE=1 
-DMOZ_USER_DIR=\"Mozilla\" -DMOZ_ENABLE_LIBXUL=1 -DMOZ_XUL=1 
-DMOZ_PROFILELOCKING=1 -DMOZ_DLL_SUFFIX=\".dll\" -DJS_THREADSAFE=1 
-DMOZILLA_LOCALE_VERSION=\"1.9a1\" -DMOZILLA_REGION_VERSION=\"1.9a1\" 
-DMOZILLA_SKIN_VERSION=\"1.8\"  -D_MOZILLA_CONFIG_H_ -DMOZILLA_CLIENT 
/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src/../nsJavaInterfaces.cpp
f:/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src/../nsJavaInterfaces.cpp: 
In function `_jobject* 
Java_org_mozilla_xpcom_internal_XPCOMImpl_newLocalFile(JNIEnv*, 
_jobject*, _jstring*, jboolean)':
f:/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src/../nsJavaInterfaces.cpp:210: 
error: invalid conversion from `const jchar*' to `const PRUnichar*'
f:/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src/../nsJavaInterfaces.cpp:216: 
error: no matching function for call to 
`JNIEnv_::ReleaseStringChars(_jstring*&, const PRUnichar*&)'
C:/Programmi/Java/jdk1.5.0_05/include/jni.h:1574: note: candidates are: 
void JNIEnv_::ReleaseStringChars(_jstring*, const jchar*) <near match>
make[6]: *** [nsJavaInterfaces.o] Error 1
make[6]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom/src'
make[5]: *** [libs] Error 2
make[5]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java/xpcom'
make[4]: *** [libs] Error 2
make[4]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla/extensions/java'
make[3]: *** [libs_tier_50] Error 2
make[3]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla'
make[2]: *** [tier_50] Error 2
make[2]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla'
make[1]: *** [default] Error 2
make[1]: Leaving directory 
`/cygdrive/f/mozilla_sources/sources_from_cvs/mozilla'
make: *** [build] Error 2

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I'm compiling on a Windows XP box, but since I do not have the Microsoft 
compiler, I'm using MinGW following the directions read here:
http://gemal.dk/mozilla/build.html

Any suggestion?
Thanks a lot.

Antonio