NDK Build giving errors of `undefined references` for __sfp __sflags

[akashdexati]

Below is the content of jni/Application.mk
APP_MODULES := liblept
APP_ABI := ALL
APP_OPTIM := release
APP_PLATFORM = android-8
APP_STL := gnustl_static
APP_CPPFLAGS += -fexceptions -frtti -ffat-lto-objects
NDK_TOOLCHAIN_VERSION := 4.9

Below is the content of jni/Android.mk
REAL_LOCAL_PATH := /home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android
LOCAL_PATH :=

include $(CLEAR_VARS)

LOCAL_MODULE := liblept

BLACKLIST_SRC_FILES :=
%endiantest.c
%freetype.c
%xtractprotos.c

LOCAL_SRC_FILES :=
$(filter-out $(BLACKLIST_SRC_FILES),$(wildcard $(LEPTONICA_PATH)/src/*.c))

LOCAL_CFLAGS :=
-DHAVE_CONFIG_H

LOCAL_C_INCLUDES :=
$(LIBJPEG_PATH)

LOCAL_LDLIBS :=
-lz

ifneq ($(TARGET_SIMULATOR),true)
LOCAL_SRC_FILES +=
$(REAL_LOCAL_PATH)/stdio/open_memstream.c
$(REAL_LOCAL_PATH)/stdio/fopencookie.c
$(REAL_LOCAL_PATH)/stdio/fmemopen.c

LOCAL_C_INCLUDES +=
$(REAL_LOCAL_PATH)/stdio
endif

LOCAL_SRC_FILES +=
$(REAL_LOCAL_PATH)/box.cpp
$(REAL_LOCAL_PATH)/pix.cpp
$(REAL_LOCAL_PATH)/pixa.cpp
$(REAL_LOCAL_PATH)/utilities.cpp
$(REAL_LOCAL_PATH)/readfile.cpp
$(REAL_LOCAL_PATH)/writefile.cpp
$(REAL_LOCAL_PATH)/jni.cpp

LOCAL_C_INCLUDES +=
$(REAL_LOCAL_PATH)
$(LEPTONICA_PATH)/src

LOCAL_LDLIBS +=
-ljnigraphics
-llog
-ldl

LOCAL_SHARED_LIBRARIES:= libjpeg
LOCAL_PRELINK_MODULE:= false

include $(BUILD_SHARED_LIBRARY)

Build Errors :
./obj/local/arm64-v8a/objs/lept//home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/open_memstream.o: In function open_memstream': /home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/**open_memstream.c:188: undefined reference to__sfp'**
./obj/local/arm64-v8a/objs/lept//home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fopencookie.o: In function fopencookie': /home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/**com_googlecode_leptonica_android/stdio/fopencookie.c:154: undefined reference to__sflags'**
/home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fopencookie.c:161: undefined reference to __sfp' ./obj/local/arm64-v8a/objs/lept//home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fmemopen.o: In functionfmemopen':
/home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fmemopen.c:209: undefined reference to __sflags' /home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fmemopen.c:215: undefined reference to__sfp'
/home/adarsh/Downloads/Leptonica-full-build/app/src/main/jni/com_googlecode_leptonica_android/stdio/fmemopen.c:215: undefined reference to `__sfp'
collect2: error: ld returned 1 exit status
make: *** [obj/local/arm64-v8a/liblept.so] Error 1