Patch taken from the Sage packaging system.

--- lcalc-1.23/include/Lgamma.h	2012-08-08 23:21:55.000000000 +0200
+++ lcalc-1.23/include/Lgamma.h	2014-05-18 21:15:27.786889718 +0200
@@ -77,7 +77,7 @@
 //n=0 should just give log_GAMMA(z)... thus making log_GAMMA
 //code obsolete. But leave log_GAMMA intact anyways.
 template <class ttype>
-precise(ttype) log_GAMMA (ttype z,int n=0)
+precise(ttype) log_GAMMA (ttype z,int n)
 {
     int M;
     precise(ttype) log_G,r,r2,y;
@@ -230,7 +230,7 @@
 //value exp_w which holds exp(-w)
 //computes G(z,w), so there's an extra w^(-z) factor.
 template <class ttype>
-Complex inc_GAMMA (ttype z,ttype w, const char *method="temme", ttype exp_w = 0, bool recycle=false)
+Complex inc_GAMMA (ttype z,ttype w, const char *method, ttype exp_w, bool recycle)
 {
 
     Complex G;
@@ -334,7 +334,7 @@
 
 
 template <class ttype>
-ttype cfrac_GAMMA (ttype z,ttype w, ttype exp_w=0, bool recycle=false)  //computes G(z,w) via continued fraction
+ttype cfrac_GAMMA (ttype z,ttype w, ttype exp_w, bool recycle)  //computes G(z,w) via continued fraction
 {
 
         ttype G;
@@ -424,7 +424,7 @@
 }
 
 template <class ttype>
-ttype asympt_GAMMA (ttype z,ttype w, ttype exp_w = 0, bool recycle=false)  //computes G(z,w) via asymptotic series
+ttype asympt_GAMMA (ttype z,ttype w, ttype exp_w, bool recycle)  //computes G(z,w) via asymptotic series
 {
 
         if(my_verbose>3) cout << "called asympt_GAMMA("<<z<<","<<w<<")"<< endl;
@@ -446,7 +446,7 @@
 
 
 template <class ttype>
-ttype comp_inc_GAMMA (ttype z,ttype w,ttype exp_w = 0, bool recycle=false)  //computes g(z,w)
+ttype comp_inc_GAMMA (ttype z,ttype w,ttype exp_w, bool recycle)  //computes g(z,w)
 {
 
     ttype g;
@@ -604,7 +604,7 @@
 }
 
 template <class ttype>
-Complex gamma_sum(Complex s, int what_type, ttype *coeff, int N, Double g, Complex l, Double Q, Long Period, Complex delta=1, const char *method="temme")
+Complex gamma_sum(Complex s, int what_type, ttype *coeff, int N, Double g, Complex l, Double Q, Long Period, Complex delta, const char *method)
 {
     Complex SUM=0;
 
ue=''/>
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</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=f89bd6949a4b9f02eb98d53079dc416537a9620d'>root</a>/<a href='/guix/log/gnu?id=f89bd6949a4b9f02eb98d53079dc416537a9620d'>gnu</a>/<a href='/guix/log/gnu/system?id=f89bd6949a4b9f02eb98d53079dc416537a9620d'>system</a>/<a href='/guix/log/gnu/system/examples?id=f89bd6949a4b9f02eb98d53079dc416537a9620d'>examples</a>/<a href='/guix/log/gnu/system/examples/lightweight-desktop.tmpl?id=f89bd6949a4b9f02eb98d53079dc416537a9620d'>lightweight-desktop.tmpl</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/system/examples/lightweight-desktop.tmpl?id=f89bd6949a4b9f02eb98d53079dc416537a9620d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-08-29 01:05:26 -0400'>2021-08-29</span></td><td><a href='/guix/commit/gnu/system/examples/lightweight-desktop.tmpl?id=da4e40948326387d5bcda58783914d5f9ce8b095'>Migrate to the new 'targets' field of bootloader-configuration.</a><span class='msg-avail'>...<span class='msg-tooltip'>The old 'target' field is deprecated; adjust the sources to use the new
'targets' one instead.

* doc/guix-cookbook.texi&lt;target&gt;: Replace by 'targets'.
* gnu/bootloader/grub.scm: Likewise.
* gnu/installer/parted.scm: Likewise.
* gnu/machine/digital-ocean.scm: Likewise.
* gnu/system/examples/asus-c201.tmpl: Likewise
* gnu/system/examples/bare-bones.tmpl: Likewise
* gnu/system/examples/bare-hurd.tmpl: Likewise
* gnu/system/examples/beaglebone-black.tmpl: Likewise
* gnu/system/examples/desktop.tmpl: Likewise
* gnu/system/examples/docker-image.tmpl: Likewise
* gnu/system/examples/lightweight-desktop.tmpl: Likewise
* gnu/system/examples/vm-image.tmpl: Likewise
* gnu/system/examples/yggdrasil.tmpl: Likewise
* gnu/system/hurd.scm: Likewise
* gnu/system/images/hurd.scm: Likewise
* gnu/system/images/novena.scm: Likewise
* gnu/system/images/pine64.scm: Likewise
* gnu/system/images/pinebook-pro.scm: Likewise
* gnu/system/images/rock64.scm: Likewise
* gnu/system/install.scm: Likewise
* gnu/system/vm.scm: Likewise
* gnu/tests.scm: Likewise
* gnu/tests/ganeti.scm: Likewise
* gnu/tests/install.scm: Likewise
* gnu/tests/nfs.scm: Likewise
* gnu/tests/telephony.scm: Likewise
* tests/boot-parameters.scm: Likewise
* tests/system.scm: Likewise
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2020-10-13 21:17:40 +0200'>2020-10-13</span></td><td><a href='/guix/commit/gnu/system/examples/lightweight-desktop.tmpl?id=1197b8b20f4fca4ce03bbc5fa75e18d54e3717c0'>installer: Add Emacs EXWM desktop environment.</a><span class='msg-avail'>...<span class='msg-tooltip'>Suggested by zenny via IRC.

* gnu/installer/services.scm (%system-services): Add emacs, emacs-exwm,
emacs-desktop-environment.
* etc/release-manifest.scm (%system-packages): Likewise.
* gnu/system/examples/lightweight-desktop.tmpl: Likewise.
* gnu/tests/install.scm (installation-target-desktop-os-for-gui-tests)
[packages]: Likewise
* gnu/installer/newt/services.scm (run-desktop-environments-cbt-page): Make
one entry taller.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-08-28 23:27:53 +0200'>2020-08-28</span></td><td><a href='/guix/commit/gnu/system/examples/lightweight-desktop.tmpl?id=be1c00ae3c3dc7086ada05f34c36e85adb839038'>system: Remove extra line from 'lightweight-desktop.tmpl'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to c7af96871737ffa0e2be879e200573bc60603c8c.

* gnu/system/examples/lightweight-desktop.tmpl: Remove extra
'use-package-modules' line.
</span></span></td><td>Ludovic Courtès</td></tr>