+Filtered Build-Depends: ..., gfortran, ...
+
+dpkg-buildpackage: source package fortran package
+
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -Wl,-z,relro -o balls balls.f
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -c -o quadric.o quadric.f
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -c -o suv.o suv.f
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 \
+rastep.f quadric.o suv.o -Wl,-z,relro \
+-o rastep
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -c -o render.o render.f
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -fstack-protector-strong -o balls-without-ldflags balls.f
+
+mpifort -cpp -DDOUB -g -O2 -fdebug-prefix-map=/«PKGBUILDDIR»=. -c -o transform.o transform.f90
+
+# correct
+gfortran -g -w -O2 -Wtabs -ffixed-line-length-132 -Wl,-z,relro -fstack-protector-strong -o balls balls.f
+mpifort -cpp -DDOUB -g -O2 -fdebug-prefix-map=/«PKGBUILDDIR»=. -fstack-protector-strong -c -o paste.o paste.f90