Not sure what's going wrong, as I believe I have linked to the appropriate libraries.  Using VS 2010.

Build started 2/23/2013 15:54:49.
     1>Project "J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\fltk demo\fltk demo.vcxproj" on node 2 (build target(s)).
     1>InitializeBuildStatus:
         Creating "Debug\fltk demo.unsuccessfulbuild" because "AlwaysCreate" was specified.
       ClCompile:
         All outputs are up-to-date.
       ManifestResourceCompile:
         All outputs are up-to-date.
       Link:
         All outputs are up-to-date.
         C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\link.exe /ERRORREPORT:PROMPT /OUT:"J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\Debug\fltk demo.exe" /INCREMENTAL /NOLOGO fltkgl.lib fltk.lib opengl32.lib glu32.lib freeglut.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /MANIFEST /ManifestFile:"Debug\fltk demo.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /DEBUG /PDB:"J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\Debug\fltk demo.pdb" /SUBSYSTEM:WINDOWS /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:"J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\Debug\fltk demo.lib" /MACHINE:X86 "Debug\fltk demo.exe
 .embed.manifest.res"
         Debug\main.obj c:fltk-1.3.2\lib\fltk.lib wsock32.lib comctl32.lib
       Manifest:
         C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\mt.exe /nologo /verbose /out:"Debug\fltk demo.exe.embed.manifest" /manifest "Debug\fltk demo.exe.intermediate.manifest"
         All outputs are up-to-date.
       LinkEmbedManifest:
         All outputs are up-to-date.
         fltk demo.vcxproj -> J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\Debug\fltk demo.exe
       FinalizeBuildStatus:
         Deleting file "Debug\fltk demo.unsuccessfulbuild".
         Touching "Debug\fltk demo.lastbuildstate".
     1>Done Building Project "J:\Users\Admin0\Documents\Visual Studio 2010\Projects\fltk demo\fltk demo\fltk demo.vcxproj" (build target(s)).

Build succeeded.

Time Elapsed 00:00:00.67