gfortran linking/compiling with -I and -J flags
 

I am trying to link and compile a couple of modules that are not in the current directory with a couple of my own .f90 programs and out put the .exe to a folder that is not the current directory. It appears to me that I have to use flags -I and -J when compiling with gfortran but not sure the correct use of these. If anyone can help that would be great. Many thanks!

Here's what I've tried thus far (an example) based on an online tutorial but I am getting the error "Fatal Error: Can't open module file 'spectra.mod' for reading at (1): No such file or directory" in the first line itself. mod1.mod has the correct path declared.

M_PATH=/usr/local/mod
P_PATH=~/Desktop
O_PATH=~/Documents/my_progs

gfortran -c ${P_PATH}/my_prog1.f90 -I${M_PATH}/mod1.mod -o ${O_PATH}/my_prog.o

gfortran -o ${O_PATH}/myprog.exe ${O_PATH}/my_prog.o

Solution
 

gfortran -O -I${P_PATH}/example_prog.f90 -L/${M_PATH}/ -lexample.mod -o example.exe

Note:
"-I" in -I${DSKT}/example_prog.f90 is uppercase "ai" and
"-l" in -lexample.mod is lower case "el"