diff --git a/base/test-apk.bats b/base/test-apk.bats
index a1d3f42..4ae9b65 100755
--- a/base/test-apk.bats
+++ b/base/test-apk.bats
@@ -15,6 +15,14 @@ load 'assert'
   assert_output --partial "alpine-baselayout"
 }
 
+@test "essentials" {
+  run xx-apk list xx-c-essentials
+  assert_success
+
+  run xx-apk list xx-cxx-essentials
+  assert_success
+}
+
 @test "cross" {
   target="arm64"
   if [ "$(xx-info arch)" = "arm64" ]; then target="amd64"; fi
diff --git a/base/test-apt.bats b/base/test-apt.bats
index 997a9b3..4cde980 100755
--- a/base/test-apt.bats
+++ b/base/test-apt.bats
@@ -22,6 +22,14 @@ load 'assert'
   assert_line "Package: gcc"
 }
 
+@test "essentials" {
+  run xx-apt show xx-c-essentials
+  assert_success
+
+  run xx-apt show xx-cxx-essentials
+  assert_success
+}
+
 @test "amd64" {
   export TARGETARCH=amd64
   if ! xx-info is-cross; then skip; fi
diff --git a/base/xx-apt b/base/xx-apt
index ad5e313..738f327 100755
--- a/base/xx-apt
+++ b/base/xx-apt
@@ -170,13 +170,13 @@ packages2=
 for p in ${packages}; do
   if [ "${p}" = "xx-c-essentials" ]; then
     p="libc6-dev"
-    if "$arg0" info "libgcc-10-dev:${XX_PKG_ARCH}" >/dev/null 2>/dev/null; then
+    if checkpkg "libgcc-10-dev:${XX_PKG_ARCH}" >/dev/null 2>/dev/null; then
       p="$p libgcc-10-dev"
     else
       p="$p libgcc-8-dev"
     fi
   elif [ "${p}" = "xx-cxx-essentials" ]; then
-    if "$arg0" info "libstdc++-10-dev:${XX_PKG_ARCH}" >/dev/null 2>/dev/null; then
+    if checkpkg "libstdc++-10-dev:${XX_PKG_ARCH}" >/dev/null 2>/dev/null; then
       p="libstdc++-10-dev"
     else
       p="libstdc++-8-dev"