diff -uNr mathomatic-16.0.5/am.h mathomatic-16.0.5.mod/am.h
--- mathomatic-16.0.5/am.h	2012-08-19 17:42:52.000000000 +0300
+++ mathomatic-16.0.5.mod/am.h	2017-09-14 14:36:31.112860259 +0300
@@ -57,7 +57,7 @@
 #define	TEXT_ROWS	STANDARD_SCREEN_ROWS		/* number of lines per page in the symbolic math library */
 #define	TEXT_COLUMNS	STANDARD_SCREEN_COLUMNS		/* default number of columns per page in the symbolic math library */
 
-#define	TMP_FILE	"/tmp/mathomatic.XXXXXX"	/* temporary file template for mkstemp(3) */
+#define	TMP_FILE	"@TERMUX_PREFIX@/tmp/mathomatic.XXXXXX"	/* temporary file template for mkstemp(3) */
 
 #define	PROMPT_STR	"-> "				/* user interface main prompt strings, preceded by the current equation number */
 #define	HTML_PROMPT_STR	"−> "			/* main prompt in HTML output mode, should be same number of columns as above */