Package won't build in mock:

If the next command fails -- you cannot use the X front end
test -f nmapfe/nmapfe && ./shtool install  -c -m 755 -s nmapfe/nmapfe
/var/tmp/nmap-root/usr/bin/nmapfe && rm -f /var/tmp/nmap-root/usr/bin/xnmap &&
./shtool mkln -f -s /var/tmp/nmap-root/usr/bin/nmapfe
/var/tmp/nmap-root/usr/bin/xnmap && ./shtool install  -c -m 644 nmapfe.desktop
/var/tmp/nmap-root/usr/share/applications/nmapfe.desktop && ./shtool install  -c
-m 644 docs/nmapfe.1 /var/tmp/nmap-root/usr/share/man/man1/nmapfe.1 && ./shtool
install  -c -m 644 docs/xnmap.1 /var/tmp/nmap-root/usr/share/man/man1/xnmap.1
+ desktop-file-install --vendor nmap --dir
/var/tmp/nmap-root/usr/share/applications --add-category X-Red-Hat-Base
/builddir/build/SOURCES/nmapfe.desktop
/var/tmp/rpm-tmp.92051: line 48: desktop-file-install: command not found
error: Bad exit status from /var/tmp/rpm-tmp.92051 (%install)

Attached is a patch, adding the correct BuildRequirement to make the package build.