diff --git a/vars/build.vars b/vars/build.vars
index 0cc7145..cf97828 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -34,6 +34,7 @@ HOST_TOOLS_PREFIX="${PREFIX}";
 : ${PKG_PERK_HOST_URLS_GIT:="perk=${DEFAULT_GITROOT}/perk"};
 : ${PKG_PERK_HOST_CONFIGURE_ARGS:="--prefix=/usr"};
 : ${PKG_PERK_HOST_INSTALL_FILES:="@perk=bin/${DEFAULT_TARGET}-perk"};
+: ${PKG_PERK_HOST_CFLAGS_CONFIGURE:="-I${PREFIX}/include"};
 : ${PKG_INSTALL_STRIP_HOST_NO_LOG_VARS:=1};
 : ${PKG_PKGCONF_HOST_SHA256SUM:=7ec8b516e655e247f4ba976837cee808134785819ab8f538f652fe919cc6c09f};
 : ${PKG_PKGCONF_HOST_VERSION:=0.9.12};