diff --git a/configure.ac b/configure.ac
index 6bb8d9f5..32ceba69 100644
--- a/configure.ac
+++ b/configure.ac
@@ -358,16 +358,22 @@ AM_CONDITIONAL(HAVE_LIBKMS, [test "x$LIBKMS" = xyes])
 AM_CONDITIONAL(HAVE_INTEL, [test "x$INTEL" = xyes])
 if test "x$INTEL" = xyes; then
 	AC_DEFINE(HAVE_INTEL, 1, [Have intel support])
+else
+	AC_DEFINE(HAVE_INTEL, 0)
 fi
 
 AM_CONDITIONAL(HAVE_VMWGFX, [test "x$VMWGFX" = xyes])
 if test "x$VMWGFX" = xyes; then
 	AC_DEFINE(HAVE_VMWGFX, 1, [Have vmwgfx kernel headers])
+else
+	AC_DEFINE(HAVE_VMWGFX, 0)
 fi
 
 AM_CONDITIONAL(HAVE_NOUVEAU, [test "x$NOUVEAU" = xyes])
 if test "x$NOUVEAU" = xyes; then
 	AC_DEFINE(HAVE_NOUVEAU, 1, [Have nouveau (nvidia) support])
+else
+	AC_DEFINE(HAVE_NOUVEAU, 0)
 fi
 
 AM_CONDITIONAL(HAVE_OMAP, [test "x$OMAP" = xyes])
@@ -375,6 +381,8 @@ AM_CONDITIONAL(HAVE_OMAP, [test "x$OMAP" = xyes])
 AM_CONDITIONAL(HAVE_EXYNOS, [test "x$EXYNOS" = xyes])
 if test "x$EXYNOS" = xyes; then
 	AC_DEFINE(HAVE_EXYNOS, 1, [Have EXYNOS support])
+else
+	AC_DEFINE(HAVE_EXYNOS, 0)
 fi
 
 AM_CONDITIONAL(HAVE_FREEDRENO, [test "x$FREEDRENO" = xyes])
@@ -392,6 +400,8 @@ fi
 AM_CONDITIONAL(HAVE_RADEON, [test "x$RADEON" = xyes])
 if test "x$RADEON" = xyes; then
 	AC_DEFINE(HAVE_RADEON, 1, [Have radeon support])
+else
+	AC_DEFINE(HAVE_RADEON, 0)
 fi
 
 if test "x$AMDGPU" != xno; then
@@ -421,6 +431,8 @@ if test "x$AMDGPU" = xyes; then
 	if test "x$have_cunit" = "xno"; then
 		AC_MSG_WARN([Could not find cunit library. Disabling amdgpu tests])
 	fi
+else
+	AC_DEFINE(HAVE_AMDGPU, 0)
 fi
 
 AM_CONDITIONAL(HAVE_TEGRA, [test "x$TEGRA" = xyes])
@@ -428,6 +440,8 @@ AM_CONDITIONAL(HAVE_TEGRA, [test "x$TEGRA" = xyes])
 AM_CONDITIONAL(HAVE_VC4, [test "x$VC4" = xyes])
 if test "x$VC4" = xyes; then
 	AC_DEFINE(HAVE_VC4, 1, [Have VC4 support])
+else
+	AC_DEFINE(HAVE_VC4, 0)
 fi
 
 AM_CONDITIONAL(HAVE_ETNAVIV, [test "x$ETNAVIV" = xyes])
diff --git a/libkms/linux.c b/libkms/linux.c
index 0b50777e..1431eb10 100644
--- a/libkms/linux.c
+++ b/libkms/linux.c
@@ -110,27 +110,27 @@ linux_from_sysfs(int fd, struct kms_driver **out)
 	if (ret)
 		return ret;
 
-#ifdef HAVE_INTEL
+#if HAVE_INTEL
 	if (!strcmp(name, "intel"))
 		ret = intel_create(fd, out);
 	else
 #endif
-#ifdef HAVE_VMWGFX
+#if HAVE_VMWGFX
 	if (!strcmp(name, "vmwgfx"))
 		ret = vmwgfx_create(fd, out);
 	else
 #endif
-#ifdef HAVE_NOUVEAU
+#if HAVE_NOUVEAU
 	if (!strcmp(name, "nouveau"))
 		ret = nouveau_create(fd, out);
 	else
 #endif
-#ifdef HAVE_RADEON
+#if HAVE_RADEON
 	if (!strcmp(name, "radeon"))
 		ret = radeon_create(fd, out);
 	else
 #endif
-#ifdef HAVE_EXYNOS
+#if HAVE_EXYNOS
 	if (!strcmp(name, "exynos"))
 		ret = exynos_create(fd, out);
 	else
diff --git a/meson.build b/meson.build
index fa00254b..7298f741 100644
--- a/meson.build
+++ b/meson.build
@@ -256,9 +256,7 @@ foreach t : [[with_intel, 'INTEL'], [with_vmwgfx, 'VMWGFX'],
              [with_exynos, 'EXYNOS'],
              [with_vc4, 'VC4'],
              [with_radeon, 'RADEON']]
-  if t[0]
-    config.set10('HAVE_@0@'.format(t[1]), true)
-  endif
+  config.set10('HAVE_@0@'.format(t[1]), t[0])
 endforeach
 if with_freedreno_kgsl
   if not with_freedreno