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gcc, cygwin, jni headers

Ive seen one other post on this topic but there were no replies. Maybe Ill
be more lucky.
Im trying to compile a simple dll using gcc and cygwin. Something very
similar to below used to work on dos and mingw but now Im geting loads of
errors as gcc tries to compile some headers?! Below is my make file and the
first few lines of the output. Please help. Its not that I should be using
solaris versions of the Java headers (jni_md.h and jawt_md.h) is it? TIA.

#### MAKEFILE ####

JAVA_HOME = C:/Progra~1/java/jdk14~1.0

CC = gcc
LD = gcc
RM = rm
SHELL = /bin/sh

CFLAGS = -O #-v --save-temps
LDFLAGS = -I$(SRC_DIR) -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/win32



.PHONY: all
all: jvmpi1_1.dll

jvmpi1_1.dll: $(SOURCES)
 $(CC) -D_BUILD_DLL $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared -o $@
$(SOURCES) -Wl,--kill-at

%.d: %.c
 $(SHELL) -ec '$(CC) -MM $(CPPFLAGS) $< \
  | sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
  [ -s $@ ] || rm $(RMFLAGS) $@'

ifneq ($(MAKECMDGOALS), clean)
ifneq ($(MAKECMDGOALS), cleanall)
include $(SOURCES:.c=.d)

.PHONY: clean cleanall
 -$(RM) $(RMFLAGS) *.o *.d
cleanall: clean
 -$(RM) $(RMFLAGS) *.exe *.dll

#### OUTPUT ####

gcc -D_BUILD_DLL  -O  -I. -IC:/Progra~1/java/jdk14~1.0/include -IC:/Progra~1
a/jdk14~1.0/include/win32 -shared -o jvmpi1_1.dll ./jvmpi1_1.c -Wl,--kill-at
In file included from C:/Progra~1/java/jdk14~1.0/include/jni.h:30,
                 from jvmpi1_1.h:8,
                 from ./jvmpi1_1.c:5:
C:/Progra~1/java/jdk14~1.0/include/win32/jni_md.h:19: parse error before
C:/Progra~1/java/jdk14~1.0/include/win32/jni_md.h:19: warning: data
definition h
as no type or storage class
In file included from jvmpi1_1.h:8,
                 from ./jvmpi1_1.c:5:
C:/Progra~1/java/jdk14~1.0/include/jni.h:111: parse error before `jlong'
C:/Progra~1/java/jdk14~1.0/include/jni.h:111: warning: no semicolon at end
of st
ruct or union
C:/Progra~1/java/jdk14~1.0/include/jni.h:115: parse error before `}'
C:/Progra~1/java/jdk14~1.0/include/jni.h:115: warning: data definition has
no ty
pe or storage class
C:/Progra~1/java/jdk14~1.0/include/jni.h:258: parse error before `jvalue'

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