Detlef,
here is my environment file
[Environment]
Description 1=
Description 2=
Description 3=
PRG Compiler ver=
C compiler ver=
Subsystem=
Author=
Last update=10/28/2008
[Advanced]
Command types=1,1,1,1,1,1,1,1,1
[Harbour]
HB_INSTALL=C:\xHarbour
HB_COMMAND=%HB_BIN_INSTALL%\Harbour.Exe %PRG% /m /n0 /w1 /es1 /a /v /i%HB_INC_INSTALL%
Option prefix=/
[C]
C_INSTALL=d:\Borland\BCC55
C_COMP_COMMAND=%C_BIN_INSTALL%\Bcc32.Exe -M -c -O2 Â -tW -v- -X %CRLF%-DHB_FM_STATISTICS_OFF %CRLF%-DHB_NO_DEFAULT_API_MACROS %CRLF%-DHB_NO_DEFAULT_STACK_MACROS %CRLF%-DHB_OS_WIN_32 %CRLF%-I%C_INC_INSTALL%;%HB_INC_INSTALL% Â -n%HOME%\Obj %C%%CRLF%
C_LIB_COMMAND=%C_BIN_INSTALL%\TLib.Exe %LIB% /P512 @%RSP% , %LST%
C_LINK_COMMAND=%C_BIN_INSTALL%\iLink32.Exe -Gn -aa -Tpe -s @%LNK%
C_RC_COMMAND=%C_BIN_INSTALL%\Brc32.Exe -r  -id:\Borland\PellesC\include;d:\Borland\PellesC\Include\win  -fo%RES%  %RC%
C_DLL_COMMAND=%C_BIN_INSTALL%\iLink32.Exe -Gn -aa -Tpd -M -L%C_LIB_INSTALL% @%LNK%
Option prefix=-
[User]
POSTEXE_COMMAND=
POSTLIB_COMMAND=
POSTDLL_COMMAND=
[Files]
%C_LIB_INSTALL%\C0W32.OBJ=1
D:\FwH\LIB\FiveHX.lib=2
D:\FwH\LIB\FiveHC.lib=3
%HB_LIB_INSTALL%\rtl.lib=4
%HB_LIB_INSTALL%\vm.lib=5
%HB_LIB_INSTALL%\gtgui.lib=6
%HB_LIB_INSTALL%\lang.lib=7
%HB_LIB_INSTALL%\macro.lib=8
%HB_LIB_INSTALL%\common.lib=9
%HB_LIB_INSTALL%\pp.lib=10
%HB_LIB_INSTALL%\rdd.lib=11
%HB_LIB_INSTALL%\HBSIX.LIB=12
%HB_LIB_INSTALL%\dbfntx.lib=13
%HB_LIB_INSTALL%\dbfcdx.lib=14
%HB_LIB_INSTALL%\dbffpt.lib=15
%HB_LIB_INSTALL%\PCREPOS.LIB=16
%HB_LIB_INSTALL%\libnf.lib=17
%HB_LIB_INSTALL%\CT.LIB=18
%C_LIB_INSTALL%\CW32.LIB=19
%C_LIB_INSTALL%\IMPORT32.LIB=20
[DLL Files]
%HB_LIB_INSTALL%\harbour.lib=1
%C_LIB_INSTALL%\C0W32.OBJ=2
%C_LIB_INSTALL%\CW32.LIB=3
%C_LIB_INSTALL%\IMPORT32.LIB=4
Just adjust the path for Bcc, xHarbour and Fivewin. I´m using the include files of PellesC, because I use it´s resource editor, but you can change this line and insert the path for the borland include files
C_RC_COMMAND=%C_BIN_INSTALL%\Brc32.Exe -r  -id:\Borland\PellesC\include;d:\Borland\PellesC\Include\win  -fo%RES%  %RC%