I started a fresh, empty visualgdb project and added a multitude of files to the same directory.  I then highlighted them in the solution explorer and added them to the project.
upon running, I am getting this error:
1>------ Build started: Project: btif-linux-port, Configuration: Debug Win32 ------
1>  VisualGDB: Attempting inline build...
1>  VisualGDB: Run "cmd.exe /c "C:\SysGCC\Raspberry\bin\make.exe" CONFIG=Debug" in directory "C:\Users\smithd\Documents\loca_code\vgdb\btif-linux-port\btif-linux-port" on local computer
1>  C:/SysGCC/Raspberry/bin/arm-linux-gnueabihf-g++.exe -ggdb -ffunction-sections -O0   -DDEBUG  -c ADC.cpp -o Debug/ADC.o -MD -MF Debug/ADC.dep
1>  In file included from ADC.cpp:28:0:
1>C:\Users\smithd\Documents\loca_code\vgdb\btif-linux-port\btif-linux-port\LPCxxxx.h(4,21): fatal error : LPC17xx.h: No such file or directory
1>  compilation terminated.
1>  make: *** [Debug/ADC.o] Error 1
1>  -------------------------------------------------------------
1>  Command exited with code 2
1>  Executable: cmd.exe
1>  Arguments: /c "C:\SysGCC\Raspberry\bin\make.exe" CONFIG=Debug
1>  Directory: C:\Users\smithd\Documents\loca_code\vgdb\btif-linux-port\btif-linux-port
1>VisualGDB : error : Command-line action failed
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets(38,5): error MSB3073: The command ""C:\Program Files (x86)\Sysprogs\VisualGDB\VisualGDB.exe" /build "C:\Users\smithd\Documents\loca_code\vgdb\btif-linux-port\btif-linux-port\btif-linux-port.vcxproj" "/solution:C:\Users\smithd\Documents\loca_code\vgdb\btif-linux-port\btif-linux-port.sln" "/config:Debug" "/platform:Win32"" exited with code 1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
why is this?  I see the file that it is referring to in the project solution explorer: LPC17xx.h