It appears that the linker is unable to open Bose.exe, your target exectuable, for writing.

The most common reason for this error is that the executable, Bose.exe, is still running in the background.  I would suggest opening the Windows Task Manager and trying to locate the process.  After you kill the process, you should be able to proceed with compiling your executable.

==============================================================================
Open Watcom Make Version 1.9 (Built on Feb  4 2013)
Portions Copyright (c) 1988-2002 Sybase, Inc. All Rights Reserved.
Source code is available under the Sybase Open Watcom Public License.
See http://www.openwatcom.org/ for details.
    "C:\Program Files (x86)\Simply Fortran 2\mingw-w64\bin\gfortran.exe" -c -o "build\Wavemod.o" -g -m32 -IC:/Users/johnti_adm/AppData/Local/sfpm/32/include  -Jmodules ".\Wavemod.f90"
    "C:\Program Files (x86)\Simply Fortran 2\fwin\wtouch.exe" -c "modules\waves.mod"
    "C:\Program Files (x86)\Simply Fortran 2\mingw-w64\bin\gfortran.exe" -c -o "build\Wavedata.o" -g -m32 -IC:/Users/johnti_adm/AppData/Local/sfpm/32/include  -Jmodules ".\Wavedata.f90"
    "C:\Program Files (x86)\Simply Fortran 2\mingw-w64\bin\gfortran.exe" -c -o "build\Wavenr.o" -g -m32 -IC:/Users/johnti_adm/AppData/Local/sfpm/32/include  -Jmodules ".\Wavenr.f90"
    "C:\Program Files (x86)\Simply Fortran 2\mingw-w64\bin\gfortran.exe" -o "Bose.exe" -m32 "build\Wavedata.o" "build\Wavemod.o" "build\Wavenr.o" -LC:/PROGRA~2/SIMPLY~1/MINGW-~1/lib/ -LC:/Users/johnti_adm/AppData/Local/sfpm/32/lib
c:/program files (x86)/simply fortran 2/mingw-w64/bin/../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot open output file Bose.exe: Permission denied
collect2.exe: error: ld returned 1 exit status
Error(E42): Last command making (Bose.exe) returned a bad status
Error(F43): Deleting (Bose.exe): Permission denied
Error(E02): Make execution terminated