All I want is to get an executable

I used this:

mingw32-make.exe dfss-a.o pg1dmult.o dsub.o lubanded.o dgaussj.o dbess.o

and got this

C:\Users\tuli\Documents\total\MAKEPFSS>mingw32-make.exe dfss-a.o pg1dmult.o dsub .o lubanded.o dgaussj.o dbess.o
f77   -c -o dfss-a.o DFSS-A.F
process_begin: CreateProcess(NULL, f77 -c -o dfss-a.o DFSS-A.F, ...) failed.
make (e=2): The system cannot find the file specified.
mingw32-make.exe: *** [dfss-a.o] Error 2