here is the exact error for Lemmings:
C:\My Documents\I-Paq Development\EasyCE 1.5\lemmfullsrc\EasyCE.cpp(14): Could not find the file ptc.h.
Linking...
EasyCE.obj : error LNK2019: unresolved external symbol SHFullScreen referenced in function "void __cdecl taskbar(bool)" (?taskbar@@YAX_N@Z)
ARMDbg/Lemmings.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
Lemmings.exe - 2 error(s), 0 warning(s)