diff --git a/configure.ac b/configure.ac
index dad11993d15b39c809088bb1437d4e3550a3e11e..5ad10e87265ad5f00031ca4c87303808adb8c622 100644
--- a/configure.ac
+++ b/configure.ac
@@ -41,42 +41,6 @@ AX_CHECK_ENABLE_DEBUG
 AC_PROG_CC
 AM_PROG_CC_C_O
 
-
-# Subgrid options
-# if you add a restriction (e.g. not cooling, chemistry or hydro)
-# you will need to check for overwrite after ready the parameter
-# see AC_ARG_WITH for cooling for an example.
-AC_ARG_WITH([subgrid],
-	[AS_HELP_STRING([--with-subgrid=<subgrid>],
-		[Name of the subgrid methods. Inexperiented user should start from here @<:@none, gear default: none@:>@]
-	)],
-	[with_subgrid="$withval"],
-	[with_subgrid=none]
-)
-
-# default values
-with_subgrid_cooling=none
-with_subgrid_chemistry=none
-with_subgrid_hydro=none
-
-case "$with_subgrid" in
-   none)
-      ;;
-   gear)
-	with_subgrid_cooling=grackle
-	with_subgrid_chemistry=gear
-	with_subgrid_hydro=gadget2
-	;;
-   eagle)
-	with_subgrid_cooling=EAGLE
-	with_subgrid_chemistry=EAGLE
-   *)
-      AC_MSG_ERROR([Unknown subgrid: $with_subgrid])
-      ;;
-esac
-
-
-
 # If debug is selected then we also define SWIFT_DEVELOP_MODE to control
 # any developer code options.
 if test "x$ax_enable_debug" != "xno"; then
@@ -853,15 +817,6 @@ AC_ARG_WITH([hydro],
    [with_hydro="$withval"],
    [with_hydro="gadget2"]
 )
-
-if test "$with_subgrid" != "none"; then
-   if test "$with_hydro" != "gadget2"; then
-      AC_MSG_ERROR([Cannot provide with-subgrid and with-hydro together])
-   else
-      with_hydro="$with_subgrid_hydro"
-   fi
-fi
-
 case "$with_hydro" in
    gadget2)
       AC_DEFINE([GADGET2_SPH], [1], [Gadget-2 SPH])
@@ -1045,15 +1000,6 @@ AC_ARG_WITH([cooling],
    [with_cooling="$withval"],
    [with_cooling="none"]
 )
-
-if test "$with_subgrid" != "none"; then
-   if test "$with_cooling" != "none"; then
-      AC_MSG_ERROR([Cannot provide with-subgrid and with-cooling together])
-   else
-      with_cooling="$with_subgrid_cooling"
-   fi
-fi
-
 case "$with_cooling" in
    none)
       AC_DEFINE([COOLING_NONE], [1], [No cooling function])
@@ -1096,15 +1042,6 @@ AC_ARG_WITH([chemistry],
    [with_chemistry="$withval"],
    [with_chemistry="none"]
 )
-
-if test "$with_subgrid" != "none"; then
-   if test "$with_chemistry" != "none"; then
-      AC_MSG_ERROR([Cannot provide with-subgrid and with-chemistry together])
-   else
-      with_chemistry="$with_subgrid_chemistry"
-   fi
-fi
-
 case "$with_chemistry" in
    none)
       AC_DEFINE([CHEMISTRY_NONE], [1], [No chemistry function])
@@ -1165,6 +1102,7 @@ AC_ARG_WITH([multipole-order],
 )
 AC_DEFINE_UNQUOTED([SELF_GRAVITY_MULTIPOLE_ORDER], [$with_multipole_order], [Multipole order])
 
+
 # Check for git, needed for revision stamps.
 AC_PATH_PROG([GIT_CMD], [git])
 AC_SUBST([GIT_CMD])