diff --git a/INSTALL/INSTALL.centos7.txt b/INSTALL/INSTALL.centos7.txt
index 57062fa00..f19d7cbc9 100644
--- a/INSTALL/INSTALL.centos7.txt
+++ b/INSTALL/INSTALL.centos7.txt
@@ -26,7 +26,7 @@ rpm -Uvh epel.rpm
 yum install vim
 
 # Install the dependencies:
-yum install git httpd zip php redis mysql-server php-mysql python-devel python-pip libxslt-devel zlib-devel php-devel php-xml php-mbstring
+yum install gcc git httpd zip php redis mysql-server php-mysql python-devel python-pip libxslt-devel zlib-devel php-devel php-xml php-mbstring
 yum install php-pear php-pecl-geoip
 
 pear channel-update pear.php.net
diff --git a/INSTALL/INSTALL.ubuntu1404.txt b/INSTALL/INSTALL.ubuntu1404.txt
index 827e0c41a..813befdd5 100644
--- a/INSTALL/INSTALL.ubuntu1404.txt
+++ b/INSTALL/INSTALL.ubuntu1404.txt
@@ -27,7 +27,7 @@ Once the system is installed you can perform the following steps as root:
 apt-get install vim
 
 # Install the dependencies:
-apt-get install zip php-pear git redis-server make python-dev python-pip libxml2-dev libxslt1-dev zlib1g-dev php5-dev libapache2-mod-php5 curl
+apt-get install gcc zip php-pear git redis-server make python-dev python-pip libxml2-dev libxslt1-dev zlib1g-dev php5-dev libapache2-mod-php5 curl
 pear install Crypt_GPG    # we need version >1.3.0 
 pear install Net_GeoIP