diff -ruN tesseract-4.1.1/src/api/baseapi.cpp tesseract-4.1.1-android/src/api/baseapi.cpp
--- tesseract-4.1.1/src/api/baseapi.cpp	2019-12-26 23:21:51.000000000 +0900
+++ tesseract-4.1.1-android/src/api/baseapi.cpp	2019-12-29 07:09:51.811379194 +0900
@@ -39,6 +39,10 @@
 #include <unistd.h>
 #endif  // _WIN32
 
+#include <stdio.h>
+int fgetpos(FILE* __fp, fpos_t* __pos);
+int fsetpos(FILE* __fp, const fpos_t* __pos);
+
 #include <cmath>               // for round, M_PI
 #include <cstdint>             // for int32_t
 #include <cstring>             // for strcmp, strcpy
diff -ruN tesseract-4.1.1/src/api/Makefile.am tesseract-4.1.1-android/src/api/Makefile.am
--- tesseract-4.1.1/src/api/Makefile.am	2019-12-29 07:09:40.275394645 +0900
+++ tesseract-4.1.1-android/src/api/Makefile.am	2019-12-29 07:09:51.811379194 +0900
@@ -80,7 +80,7 @@
 libtesseract_la_LIBADD += ../arch/libtesseract_sse.la
 endif
 
-libtesseract_la_LDFLAGS += -version-info $(GENERIC_LIBRARY_VERSION) $(NOUNDEFINED)
+libtesseract_la_LDFLAGS += -avoid-version $(NOUNDEFINED)
 
 bin_PROGRAMS = tesseract
 tesseract_SOURCES = tesseractmain.cpp
@@ -105,5 +105,5 @@
 libtesseract_la_LDFLAGS += -no-undefined -Wl,--as-needed -lws2_32
 endif
 if ADD_RT
-tesseract_LDADD += -lrt
+tesseract_LDADD += 
 endif
diff -ruN tesseract-4.1.1/src/api/Makefile.in tesseract-4.1.1-android/src/api/Makefile.in
--- tesseract-4.1.1/src/api/Makefile.in	2019-12-29 07:09:40.275394645 +0900
+++ tesseract-4.1.1-android/src/api/Makefile.in	2019-12-29 07:12:16.559185386 +0900
@@ -92,7 +92,7 @@
 @VISIBILITY_TRUE@am__append_9 = -DTESS_IMPORTS
 @T_WIN_TRUE@am__append_10 = -lws2_32
 @T_WIN_TRUE@am__append_11 = -no-undefined -Wl,--as-needed -lws2_32
-@ADD_RT_TRUE@am__append_12 = -lrt
+@ADD_RT_TRUE@am__append_12 =
 subdir = src/api
 DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(srcdir)/tess_version.h.in $(top_srcdir)/config/depcomp \
@@ -419,7 +419,7 @@
 	wordstrboxrenderer.cpp renderer.cpp
 libtesseract_la_LDFLAGS = $(LEPTONICA_LIBS) $(OPENCL_LDFLAGS) \
 	$(libarchive_LIBS) $(libcurl_LIBS) $(TENSORFLOW_LIBS) \
-	-version-info $(GENERIC_LIBRARY_VERSION) $(NOUNDEFINED) \
+	-avoid-version $(NOUNDEFINED) \
 	$(am__append_11)
 libtesseract_la_SOURCES = 
 # Dummy C++ source to cause C++ linking.
diff -ruN tesseract-4.1.1/src/lstm/lstm.cpp tesseract-4.1.1-android/src/lstm/lstm.cpp
--- tesseract-4.1.1/src/lstm/lstm.cpp	2019-12-26 23:21:51.000000000 +0900
+++ tesseract-4.1.1-android/src/lstm/lstm.cpp	2019-12-29 07:10:04.488362217 +0900
@@ -33,6 +33,10 @@
 #include "networkscratch.h"
 #include "tprintf.h"
 
+#if (defined(_MSC_VER) && _MSC_VER < 1900) || defined(ANDROID)
+extern double log2(double n);
+#endif  // _MSC_VER
+
 // Macros for openmp code if it is available, otherwise empty macros.
 #ifdef _OPENMP
 #define PARALLEL_IF_OPENMP(__num_threads)                                  \
diff -ruN tesseract-4.1.1/src/lstm/weightmatrix.cpp tesseract-4.1.1-android/src/lstm/weightmatrix.cpp
--- tesseract-4.1.1/src/lstm/weightmatrix.cpp	2019-12-26 23:21:51.000000000 +0900
+++ tesseract-4.1.1-android/src/lstm/weightmatrix.cpp	2019-12-29 07:10:04.488362217 +0900
@@ -23,6 +23,10 @@
 #include "statistc.h"
 #include "tprintf.h"
 
+#if (defined(_MSC_VER) && _MSC_VER < 1900) || defined(ANDROID)
+extern double log2(double n);
+#endif  // _MSC_VER
+
 namespace tesseract {
 
 #if defined(ANDROID)
diff -ruN tesseract-4.1.1/src/training/fileio.cpp tesseract-4.1.1-android/src/training/fileio.cpp
--- tesseract-4.1.1/src/training/fileio.cpp	2019-12-26 23:21:51.000000000 +0900
+++ tesseract-4.1.1-android/src/training/fileio.cpp	2019-12-29 07:10:04.487362218 +0900
@@ -19,7 +19,6 @@
 #include <io.h>
 #endif
 #else
-#include <glob.h>
 #include <unistd.h>
 #endif
 
@@ -119,16 +118,7 @@
 }
 #else
 bool File::DeleteMatchingFiles(const char* pattern) {
-  glob_t pglob;
-  char **paths;
-  bool all_deleted = true;
-  if (glob(pattern, 0, nullptr, &pglob) == 0) {
-    for (paths = pglob.gl_pathv; *paths != nullptr; paths++) {
-      all_deleted &= File::Delete(*paths);
-    }
-    globfree(&pglob);
-  }
-  return all_deleted;
+    return false;
 }
 #endif