2018-05-31 from--https://blog.csdn.net/tjd0227/article/details/80527967
编译OpenWRT时报错：
gconvert.c:61:2: error: #error GNU libiconv not in use but included iconv.h is from libiconv
#error GNU libiconv not in use but included iconv.h is from libiconv
解决1：
$ cd build_dir/host/pkg-config-*/glib
$ ./configure --enable-iconv=no --with-libiconv=gnu
解决2：
diff --git a/tools/pkg-config/Makefile b/tools/pkg-config/Makefile
index 0edc807..386bacf 100644
--- a/tools/pkg-config/Makefile
+++ b/tools/pkg-config/Makefile
@@ -20,7 +20,7 @@ include $(INCLUDE_DIR)/host-build.mk
HOST_LDFLAGS += $(HOST_STATIC_LINKING)
unexport PKG_CONFIG
-HOST_CONFIGURE_ARGS += --with-internal-glib
+HOST_CONFIGURE_ARGS += --with-internal-glib --with-libiconv=gnu
