diff --git a/pkgs/development/libraries/glib/setup-hook.sh b/pkgs/development/libraries/glib/setup-hook.sh
index 9eabf8a679a9b..40336f2972836 100644
--- a/pkgs/development/libraries/glib/setup-hook.sh
+++ b/pkgs/development/libraries/glib/setup-hook.sh
@@ -14,7 +14,7 @@ glibPreInstallPhase() {
 }
 appendToVar preInstallPhases glibPreInstallPhase
 
-glibPreFixupPhase() {
+glibPostInstallHook() {
     # Move gschemas in case the install flag didn't help
     if [ -d "$prefix/share/glib-2.0/schemas" ]; then
         mkdir -p "${!outputLib}/share/gsettings-schemas/$name/glib-2.0"
@@ -25,10 +25,7 @@ glibPreFixupPhase() {
 }
 
 # gappsWrapperArgsHook expects GSETTINGS_SCHEMAS_PATH variable to be set by this.
-# Until we have dependency mechanism in generic builder, we need to use this ugly hack.
-if [[ " ${preFixupPhases:-} " =~ " gappsWrapperArgsHook " ]]; then
-    preFixupPhases+=" "
-    preFixupPhases="${preFixupPhases/ gappsWrapperArgsHook / glibPreFixupPhase gappsWrapperArgsHook }"
-else
-    preFixupPhases+=" glibPreFixupPhase"
-fi
+# Until we have dependency mechanism in generic builder, we need to use this hack.
+# This relies on the fact that postInstallHooks are run *after* postInstall passed to
+# mkDerivation.
+postInstallHooks+=(glibPostInstallHook)
diff --git a/pkgs/development/libraries/gobject-introspection/setup-hook.sh b/pkgs/development/libraries/gobject-introspection/setup-hook.sh
index 50571a8f914d1..ee048867a278e 100644
--- a/pkgs/development/libraries/gobject-introspection/setup-hook.sh
+++ b/pkgs/development/libraries/gobject-introspection/setup-hook.sh
@@ -19,13 +19,8 @@ giDiscoverSelf() {
 }
 
 # gappsWrapperArgsHook expects GI_TYPELIB_PATH variable to be set by this.
-# Until we have dependency mechanism in generic builder, we need to use this ugly hack.
-if [[ " ${preFixupPhases:-} " =~ " gappsWrapperArgsHook " ]]; then
-    preFixupPhases+=" "
-    preFixupPhases="${preFixupPhases/ gappsWrapperArgsHook / giDiscoverSelf gappsWrapperArgsHook }"
-else
-    preFixupPhases+=" giDiscoverSelf"
-fi
+# Until we have dependency mechanism in generic builder, we need to use this hack.
+postInstallHooks+=(giDiscoverSelf)
 
 _multioutMoveGlibGir() {
   moveToOutput share/gir-1.0 "${!outputDev}"
diff --git a/pkgs/development/python-modules/pytest-forked/setup-hook.sh b/pkgs/development/python-modules/pytest-forked/setup-hook.sh
index 0eff690e9079e..88ccd0aac171b 100644
--- a/pkgs/development/python-modules/pytest-forked/setup-hook.sh
+++ b/pkgs/development/python-modules/pytest-forked/setup-hook.sh
@@ -12,21 +12,7 @@ pytestForkedHook() {
     fi
 }
 
-# the flags should be added before pytestCheckHook runs so
-# until we have dependency mechanism in generic builder, we need to use this ugly hack.
-
 if [ -z "${dontUsePytestForked-}" ] && [ -z "${dontUsePytestCheck-}" ]; then
-    if [[ " ${preDistPhases[*]:-} " =~ " pytestCheckPhase " ]]; then
-        _preDistPhases="${preDistPhases[*]} "
-        _preDistPhases="${_preDistPhases/ pytestCheckPhase / pytestForkedHook pytestCheckPhase }"
-        if [[ -n "${__structuredAttrs-}" ]]; then
-            preDistPhases=()
-        else
-            preDistPhases=""
-        fi
-        appendToVar preDistPhases $_preDistPhases
-        unset _preDistPhases
-    else
-        appendToVar preDistPhases pytestForkedHook
-    fi
+    # The flags should be added before pytestCheckHook runs in preDistPhases.
+    postInstallCheckHooks+=(pytestForkedHook)
 fi
diff --git a/pkgs/development/python-modules/pytest-xdist/setup-hook.sh b/pkgs/development/python-modules/pytest-xdist/setup-hook.sh
index 9819e0d3ec7d2..8600ce998acc4 100644
--- a/pkgs/development/python-modules/pytest-xdist/setup-hook.sh
+++ b/pkgs/development/python-modules/pytest-xdist/setup-hook.sh
@@ -4,21 +4,7 @@ pytestXdistHook() {
     )
 }
 
-# the flags should be added before pytestCheckHook runs so
-# until we have dependency mechanism in generic builder, we need to use this ugly hack.
-
 if [ -z "${dontUsePytestXdist-}" ] && [ -z "${dontUsePytestCheck-}" ]; then
-    if [[ " ${preDistPhases[*]:-} " =~ " pytestCheckPhase " ]]; then
-        _preDistPhases="${preDistPhases[*]} "
-        _preDistPhases="${_preDistPhases/ pytestCheckPhase / pytestXdistHook pytestCheckPhase }"
-        if [[ -n "${__structuredAttrs-}" ]]; then
-            preDistPhases=()
-        else
-            preDistPhases=""
-        fi
-        appendToVar preDistPhases $_preDistPhases
-        unset _preDistPhases
-    else
-        appendToVar preDistPhases pytestXdistHook
-    fi
+    # The flags should be added before pytestCheckHook runs in preDistPhases.
+    preInstallCheckHooks+=(pytestXdistHook)
 fi