fix automatic dependency install on Debian

configure.sh

@@ -11,7 +11,7 @@ ARCHIVE=$(basename "$URL")
 if command -v apt >/dev/null 2>&1; then
   deps="libmpfr-dev libmpc-dev libgmp-dev libpng-dev libppl-dev flex g++ git texinfo xz-utils"
   pm=apt
-  pm_has="apt show"
+  pm_has="dpkg -s"
   pm_install="sudo apt install"
 elif command -v pacman >/dev/null 2>&1; then
   deps="mpfr mpc gmp libpng ppl flex gcc git texinfo xz"
@@ -35,11 +35,11 @@ fi
 
 if [[ ! -z "$missing" ]]; then
   echo "$TAG Based on $pm, some dependencies are missing: $missing"
-  echo -n "$TAG Do you want to run '$pm_install' to install them (Y/n)? "
+  echo -n "$TAG Do you want to run '$pm_install $missing' to install them (Y/n)? "
 
   read do_install
   if [[ "$do_install" == "y" || "$do_install" == "Y" || "$do_install" == "" ]]; then
-    $pm_install
+    $pm_install $missing
   else
     echo "$TAG Skipping dependencies, hoping it will build anyway."
   fi