Following your advice i always got the error message as following:

Making install in src

make1: Entering directory `/home/clad/zzx/software/libgd-2.1.1/src'

make2: Entering directory `/home/clad/zzx/software/libgd-2.1.1/src'

/usr/bin/mkdir -p '/usr/local/lib'

/usr/bin/mkdir: cannot create directory ‘/usr/local/lib’: File exists

make2: *** install-libLTLIBRARIES Error 1

make2: Leaving directory `/home/clad/zzx/software/libgd-2.1.1/src'

make1: *** install-am Error 2<

make1: Leaving directory `/home/clad/zzx/software/libgd-2.1.1/src'

make: *** install-recursive Error 1

Then, i tried to used sources fetched from git and ran bootstrap.sh. The error message was "Can't find naturaldocs; not generating user manual."

I was really confused about what to do now.

I really appreciate it if you could spare some time and help me out.

I was really confused about what to do now.

I really appreciate it if you could spare some time and help me out.