Taken from Debian:
https://salsa.debian.org/multimedia-team/taopm/-/raw/master/debian/patches/01-add-missing-headers.diff

Description: Adding missing headers
Author: Tiago Bortoletto Vaz <tiago@debian.org>
Last-Update: 2013-04-17
--- a/libtao/Tao.cc
+++ b/libtao/Tao.cc
@@ -18,6 +18,7 @@
 
 #include "Tao.h"
 #include <iostream>
+#include <stdio.h>
 
 extern Tao tao;
 float &Time = tao.synthesisEngine.time;
--- a/libtao/TaoDevice.cc
+++ b/libtao/TaoDevice.cc
@@ -20,6 +20,7 @@
 #include "Tao.h"
 #include "TaoAccessPoint.h"
 #include "TaoInstrument.h"
+#include <cstring>
 
 TaoDevice::TaoDevice()
     {
--- a/libtao/TaoInstrument.cc
+++ b/libtao/TaoInstrument.cc
@@ -23,6 +23,7 @@
 //#include <sys/types.h>
 #include <iostream>
 #include <cmath>
+#include <cstring>
 
 float TaoInstrument::defaultMass=3.5;		// Set to optimum value for
                                                 // frequency response of
--- a/libtao/TaoOutput.cc
+++ b/libtao/TaoOutput.cc
@@ -24,6 +24,7 @@
 #include <fstream>
 #include "TaoOutput.h"
 #include "Tao.h"
+#include <cstring>
 
 extern Tao tao;
 
--- a/libtao/TaoPitch.cc
+++ b/libtao/TaoPitch.cc
@@ -30,6 +30,7 @@
 #include "TaoPitch.h"
 #include <iostream>
 #include <cmath>
+#include <cstring>
 
 // This class allows pitches and frequencies to be specified in a number of
 // different formats including the following:
--- a/taoparse/taoparser.yy
+++ b/taoparse/taoparser.yy
@@ -19,7 +19,8 @@
 
 #include <iostream>
 #include <sstream>
-#include <string>
+#include <cstring>
+#include <stdio.h>
 #include "taoparserdefs.h"
 
 int yyerror(char *s);
--- a/libtao/TaoGraphicsEngine.cc
+++ b/libtao/TaoGraphicsEngine.cc
@@ -27,7 +27,8 @@
 #include "TaoInstrument.h"
 #include "TaoAccessPoint.h"
 #include "TaoDevice.h"
-#include <string>
+#include <cstring>
+#include <stdio.h>
     
 extern Tao tao;
 extern void taoMasterTick();
--- a/tao2aiff/tao2aiff.cc
+++ b/tao2aiff/tao2aiff.cc
@@ -25,6 +25,8 @@
 #include <cmath>
 #include "audiofile.h"
 #include "tao2aiff.h"
+#include <cstdlib>
+#include <cstring>
 
 
 main(int argc, char **argv)
--- a/tao2wav/tao2wav.cc
+++ b/tao2wav/tao2wav.cc
@@ -25,6 +25,8 @@
 #include <cmath>
 #include "audiofile.h"
 #include "tao2wav.h"
+#include <cstdlib>
+#include <cstring>
 
 main(int argc, char **argv)
     {
ges</a>/<a href='/guix/log/gnu/packages/antivirus.scm?id=6340fe6f0c06386f0c9db7dee36d1d737db0e568'>antivirus.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/antivirus.scm?id=6340fe6f0c06386f0c9db7dee36d1d737db0e568&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-10-03 23:00:21 +0200'>2020-10-03</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=b7210a3241cccb80ff9056ed0c087a3bef4b0327'>gnu: clamav: Update to 0.103.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.103.0.
* gnu/packages/patches/clamav-system-tomsfastmath.patch: Update patch.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-19 02:19:30 +0200'>2020-07-19</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=7ffec020aec9ccbc531d24e65acd93e9f3962f9f'>gnu: clamav: Update to 0.102.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.102.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-05-15 20:35:57 +0200'>2020-05-15</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=6e9ffc3f778b43aa42c2142ec9ebbe3be4bf47cc'>gnu: clamav: End snippet in truth.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav)[source]: Return #t from snippet.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-05-15 20:35:57 +0200'>2020-05-15</span></td><td><a href='/guix/commit/gnu/packages/antivirus.scm?id=d2e438d3e2fb7ba24213dccd7ee04a9dbbca96c3'>gnu: clamav: Update to 0.102.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/antivirus.scm (clamav): Update to 0.102.3.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>