Update install.sh

Author: s-r-e-e-r-a-j

install.sh

@@ -81,7 +81,12 @@ install_if_needed_apt() {
 install_if_needed_rhel() {
     local pkgs=()
     if [[ $need_gcc -eq 1 ]]; then
-        pkgs+=(gcc)
+        echo "[*] Installing Development Tools group..."
+        if command -v dnf >/dev/null 2>&1; then
+            dnf groupinstall "Development Tools" -y
+        else
+            yum groupinstall "Development Tools" -y
+        fi
     fi
     if [[ $need_ncurses_headers -eq 1 ]]; then
         pkgs+=(ncurses-devel)