Install libsodium-1.0.2 and PECL libsodium on Ubuntu 14.04

install-libsodium.sh

#!/usr/bin/env bash

PECLVER="0.1.1"
LIBSODIUMVER="1.0.2"

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

gpg --fingerprint 54A2B8892CC3D6A597B92B6C210627AABA709FE1
if [ $? -ne 0 ]; then
    echo -e "\033[33mDownloading PGP Public Key...\033[0m"
    gpg --recv-keys 54A2B8892CC3D6A597B92B6C210627AABA709FE1
    # Jedi/Sector One <[email protected]>
    gpg --fingerprint 54A2B8892CC3D6A597B92B6C210627AABA709FE1
    if [ $? -ne 0 ]; then
        echo -e "\033[31mCould not download PGP public key for verification\033[0m"
        exit
    fi
fi

# Let's try to install the PECL Extension
pecl install channel://pecl.php.net/libsodium-$PECLVER
if [ $? -ne 0 ]; then
    # We need to install libsodium
    mkdir tmp
    cd tmp
    if [ ! -f libsodium-$LIBSODIUMVER.tar.gz ]; then
        wget https://download.libsodium.org/libsodium/releases/libsodium-$LIBSODIUMVER.tar.gz
    fi
    if [ ! -f libsodium-$LIBSODIUMVER.tar.gz.sig ]; then
        wget https://download.libsodium.org/libsodium/releases/libsodium-$LIBSODIUMVER.tar.gz.sig
    fi
    gpg --verify libsodium-$LIBSODIUMVER.tar.gz.sig libsodium-$LIBSODIUMVER.tar.gz
    if [ $? -eq 0 ]; then
        tar -xvzf libsodium-$LIBSODIUMVER.tar.gz
        cd libsodium-$LIBSODIUMVER
        ./configure
        make && make check
        if [ $? -eq 0 ]; then
            # we passed our tests? let's install libsodium
            make install
            if [ $? -eq 0 ]; then
                # cleanup
                cd ..
                cd ..
                rm -rf tmp
                # now let's install the PECL extension
                pecl install channel://pecl.php.net/libsodium-$PECLVER
            fi
        fi 
    else
        echo -e "\033[31mSignature did not match! Check /tmp/libsodium-$LIBSODIUMVER.tar.gz for trojans\033[0m"
        cd ..
        exit
    fi
fi

Hi,
Ran the above sh script, following errors appearing ...

pub 4096R/BA709FE1 2015-02-10
Key fingerprint = 54A2 B889 2CC3 D6A5 97B9 2B6C 2106 27AA BA70 9FE1
uid Frank Denis (Jedi/Sector One) [email protected]
uid Frank Denis [email protected]
uid Frank Denis [email protected]
uid Frank Denis (Jedi/Sector One) [email protected]
uid Frank Denis (Jedi/Sector One) [email protected]
sub 4096R/EE11A667 2015-02-10
sub 4096R/2B6F76DA 2015-02-10

downloading libsodium-0.1.1.tgz ...
Starting to download libsodium-0.1.1.tgz (162,027 bytes)
..................................done: 162,027 bytes
8 source files, building
running: phpize
Configuring for:
PHP Api Version: 20121113
Zend Module Api No: 20121212
Zend Extension Api No: 220121212
building in /tmp/pear/temp/pear-build-rootHDfigm/libsodium-0.1.1
running: /tmp/pear/temp/libsodium/configure
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for a sed that does not truncate output... /bin/sed
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether cc accepts -g... yes
checking for cc option to accept ISO C89... none needed
checking how to run the C preprocessor... cc -E
checking for icc... no
checking for suncc... no
checking whether cc understands -c and -o together... yes
checking for system library directory... lib
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking for PHP prefix... /usr
checking for PHP includes... -I/usr/include/php5 -I/usr/include/php5/main -I/usr/include/php5/TSRM -I/usr/include/php5/Zend -I/usr/include/php5/ext -I/usr/include/php5/ext/date/lib
checking for PHP extension directory... /usr/lib/php5/20121212
checking for PHP installed headers prefix... /usr/include/php5
checking if debug is enabled... no
checking if zts is enabled... no
checking for re2c... no
configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.
checking for gawk... gawk
checking for libsodium support... yes, shared
checking for libsodium files in default path... not found
configure: error: Please reinstall the libsodium distribution
ERROR: `/tmp/pear/temp/libsodium/configure' failed