[Haskell-cafe] OpenVG: Linker errors with ghc --make, but not with ghci?

I followed the instructions on how to build OpenVG on Windows. It works fine when I run the examples using "GHCi -lopenvg32", but when compiling it with "GHC --make -lopenvg32" I get a bunch of linker errors, like C:\Program Files\Haskell\OpenVG-0.1\ghc-6.10.1/libHSOpenVG-0.1.a(Paths.o):fake:(.text+0x82): undefined reference to `vgInterpolatePath' C:\Program Files\Haskell\OpenVG-0.1\ghc-6.10.1/libHSOpenVG-0.1.a(Paths.o):fake:(.text+0x40d): undefined reference to `vgModifyPathCoords' etc However it does seem that the libopenvg32.a file contains all these undefined references, and it is in the gcc-lib directory of GHC. I'm a stuck. Any hints? Thanks, Peter