Step 01
Download the Proj4 lib at http://proj.maptools.org/ (I used the 4.5.0 version - proj-4.5.0.zip)
Unpacking the zip file in:
C:\proj4
Step 02
Open the nmake.opt file in a text editor.
C:\proj4\proj-4.5.0\src\makefile.vc
Change the line:
PROJ_LIB_DIR=C:/PROJ/NAD
to:
PROJ_LIB_DIR=C:\proj4\proj-4.5.0\nad
Step 03
Execute:
C:\proj4\proj-4.5.0\src>vcvars32.bat
Note: the path to vcvars32.bat must be specified. Usually it is:
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin
Step 04
Execute:
C:\proj4\proj-4.5.0\src>nmake /f makefile.vc all
Step 05
Make the enviromente variable:
PROJ_LIB = C:\proj4\proj-4.5.0\src