Help learning how to interface with c(++)

[Kai Meyer]

I can't seem to get this to work right:

gcc -m32 -shared -fPIC Test.cpp -o libTest.so
g++ -m32 test_c.cpp -L. -lTest -o test_c
wine htod.exe Test.h Test.d
dmd test_d.d Test.d -L-L. -L-lTest -oftest_d
test_d.o: In function `_Dmain':
Test.d:(.text._Dmain+0x20): undefined reference to `increment'
collect2: ld returned 1 exit status
--- errorlevel 1
make: *** [test_d] Error 1

The resulting test_c binary from g++ works as intented (With either 
LD_LIBRARY_PATH="." or LD_RUN_PATH="."):
$ ./test_c
Count = 0
Count = 1
$ ldd test_c
	linux-gate.so.1 =>  (0x00ad1000)
	libTest.so (0x005b9000)
	libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x4970f000)
	libm.so.6 => /lib/libm.so.6 (0x4955b000)
	libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x49587000)
	libc.so.6 => /lib/libc.so.6 (0x493ab000)
	/lib/ld-linux.so.2 (0x4938a000)

Any ideas on what I'm doing wrong here?

I've dropbox-ed the code if it's helpful.
http://dl.dropbox.com/u/12135920/kai_test_c_interface.zip

-Kai Meyer