this variable is used in common context now.

package/heimdal/Makefile

@@ -72,8 +72,7 @@ endif
 TARGET_CFLAGS+=		-I${STAGING_TARGET_DIR}/usr/include/et -pthread
 
 CONFIGURE_ARGS+=	${CONFIGURE_OPTS} --with-cross-tools=${STAGING_HOST_DIR}/bin
-CONFIGURE_ENV+=		cross_compiling=yes \
-			ac_cv_func_getaddrinfo_numserv=yes
+CONFIGURE_ENV+=		ac_cv_func_getaddrinfo_numserv=yes
 
 post-extract:
 	(cd ${WRKBUILD}; rm -rf config.{cache,status} ; \

package/nspr/Makefile

@@ -20,8 +20,7 @@ include $(TOPDIR)/mk/package.mk
 
 $(eval $(call PKG_template,NSPR,${PKG_NAME},$(PKG_VERSION)-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 
-CONFIGURE_ENV+=		OS_TARGET="Linux" HOST_CC="${CC_FOR_BUILD}" HOST_CFLAGS="${CFLAGS_FOR_BUILD}" \
-			cross_compiling=yes
+CONFIGURE_ENV+=		OS_TARGET="Linux" HOST_CC="${CC_FOR_BUILD}" HOST_CFLAGS="${CFLAGS_FOR_BUILD}"
 
 ifeq (${ADK_LINUX_64},y)
 CONFIGURE_ARGS+=	--enable-64bit

package/openssl-pkcs11/Makefile

@@ -20,7 +20,6 @@ include ${TOPDIR}/mk/package.mk
 
 $(eval $(call PKG_template,OPENSSL_PKCS11,${PKG_NAME},${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 
-CONFIGURE_ENV+=		cross_compiling=yes
 CONFIGURE_ARGS+=	--with-openssl="${STAGING_TARGET_DIR}/usr"
 
 post-install: