diff --git a/pkgs/servers/sql/postgresql/libpq.nix b/pkgs/servers/sql/postgresql/libpq.nix
index 0c064e45cf99d..59e7bfd8dba00 100644
--- a/pkgs/servers/sql/postgresql/libpq.nix
+++ b/pkgs/servers/sql/postgresql/libpq.nix
@@ -12,6 +12,7 @@
   # build dependencies
   bison,
   flex,
+  makeWrapper,
   perl,
   pkg-config,
 
@@ -62,6 +63,7 @@ stdenv.mkDerivation (finalAttrs: {
   nativeBuildInputs = [
     bison
     flex
+    makeWrapper
     perl
     pkg-config
   ];
@@ -111,7 +113,20 @@ stdenv.mkDerivation (finalAttrs: {
     make -C src/interfaces/libpq install
     make -C src/port install
 
+    # Pretend pg_config is located in $out/bin to return correct paths, but
+    # actually have it in -dev to avoid pulling in all other outputs.
     moveToOutput bin/pg_config "$dev"
+    wrapProgram "$dev/bin/pg_config" --argv0 "$out/bin/pg_config"
+
+    # To prevent a "pg_config: could not find own program executable" error, we fake
+    # pg_config in the default output.
+    mkdir -p "$out/bin"
+    cat << EOF > "$out/bin/pg_config" && chmod +x "$out/bin/pg_config"
+    #!${stdenv.shell}
+    echo The real pg_config can be found in the -dev output.
+    exit 1
+    EOF
+
     moveToOutput "lib/*.a" "$dev"
 
     rm -rfv $out/share
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 978c42a0d3052..8f3add1a34f0f 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -636,7 +636,6 @@ lib.makeScope pkgs.newScope (
               {
                 name = "pdo_pgsql";
                 internalDeps = [ php.extensions.pdo ];
-                buildInputs = [ libpq ];
                 configureFlags = [ "--with-pdo-pgsql=${lib.getDev libpq}" ];
                 doCheck = false;
               }
@@ -651,7 +650,6 @@ lib.makeScope pkgs.newScope (
                 name = "pgsql";
                 buildInputs = [
                   pcre2
-                  libpq
                 ];
                 configureFlags = [ "--with-pgsql=${lib.getDev libpq}" ];
                 doCheck = false;