Made compiling work in termux

Makefile.osx

@@ -0,0 +1,10 @@
+CFLAGS=-g -Wall `pkg-config --cflags hidapi`
+LDFLAGS=`pkg-config --libs hidapi`
+
+all: lsusb howard
+
+lsusb:	lsusb.c
+	gcc -olsusb $(CFLAGS) $(LDFLAGS) lsusb.c
+
+howard:	howard.c howard.h
+	gcc -ohoward $(CFLAGS) $(LDFLAGS) howard.c

Makefile.termux

@@ -0,0 +1,10 @@
+CFLAGS=-g -D_TERMUX -Wall -I/data/data/com.termux/files/usr/include/hidapi
+LDFLAGS=-L/data/data/com.termux/files/usr/lib -lhidapi-libusb
+
+all: lsusb howard
+
+lsusb:	lsusb.c
+	gcc -olsusb $(CFLAGS) $(LDFLAGS) lsusb.c
+
+howard:	howard.c howard.h
+	gcc -ohoward $(CFLAGS) $(LDFLAGS) howard.c

howard.c

@@ -1,6 +1,13 @@
 #include <stdio.h>
 #include <stdlib.h>
+
+#ifdef _TERMUX
+#include <strings.h>
+#include <ctype.h>
+#else
 #include <string.h>
+#endif
+
 #include <wchar.h>
 #include <time.h>
 #include <hidapi.h>
@@ -316,9 +323,8 @@ int main(int argc, char *argv[]) {
     influx_init("gridbug.nethack.net", "haven", "", "");
 
     if (mode == M_TEST) {
-        int rv;
         printf("running ping...\n");
-        rv = influx_ping(retbuf);
+        influx_ping(retbuf);
     }
     exit(1);
     if (hid_init()) {