[fix] : Fixed pyalpm error

Author: Hayao0819

build.sh

@@ -364,17 +364,14 @@ prepare_env() {
     if [[ "${nodepend}" = false ]]; then
         local _check_failed=false _pkg _result=0
         msg_info "Checking dependencies ..."
+        if pacman -Qq pyalpm > /dev/null 2>&1; then
+            msg_error "pyalpm is not installed." 1
+        fi
         for _pkg in "${dependence[@]}"; do
             eval "${tools_dir}/package.py" "${_pkg}" "$( [[ "${debug}" = false ]] && echo "> /dev/null")" || _result="${?}"
-            case "${_result}" in
-                "3")
-                    _check_failed=true
-                    ;;
-                "4")
-                    [[ "${debug}" = true ]] && echo
-                    msg_error "pyalpm is not installed." ; exit 1
-                    ;;
-            esac
+            if (( _result == 3 )) || (( _result == 4 )); then
+                _check_failed=true
+            fi
             _result=0
         done
         if [[ "${_check_failed}" = true ]]; then exit 1; fi