diff --git a/configure.in b/configure.in
index a857c986..c68c822a 100644
--- a/configure.in
+++ b/configure.in
@@ -294,7 +294,7 @@ AC_CHECK_LIB(Fridge,mass_quantities_of_any_ale,, [
 
 AC_ARG_ENABLE(roothacklib,
   [  --enable-roothacklib    build window mode helper library @<:@default=yes@:>@],,
-  enable_roothacklib=yes) 
+  enable_roothacklib=yes)
 if test "x$enable_roothacklib" = "xyes"; then
   AC_CHECK_LIB(dl, dlopen, DLOPEN_LIBS=-ldl, enable_roothacklib=no)
   AC_SUBST(DLOPEN_LIBS)
@@ -306,7 +306,7 @@ AM_CONDITIONAL(BUILD_ROOTHACKLIB, test "x$enable_roothacklib" = "xyes")
 
 AC_ARG_ENABLE(modules,
   [  --enable-modules        enable support for loadable modules @<:@default=no@:>@],,
-  enable_modules=no) 
+  enable_modules=no)
 if test "x$enable_modules" = "xyes"; then
   AC_CHECK_LIB(dl, dlopen, DLOPEN_LIBS=-ldl, enable_modules=no)
   AC_SUBST(DLOPEN_LIBS)
@@ -318,7 +318,7 @@ AM_CONDITIONAL(BUILD_MODULES, test "x$enable_modules" = "xyes")
 
 AC_ARG_ENABLE(gcc-cpp,
   [  --enable-gcc-cpp        compile everything as if it were C++ @<:@default=no@:>@],,
-  enable_gcc_cpp=no) 
+  enable_gcc_cpp=no)
 if test "x$enable_gcc_cpp" = "xyes"; then
   CC="g++"
   CPPFLAGS="-x c++"