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;
 
ref='/guix/log/tests?id=ea92d1df6376552b3ce7f16298c9cecfba19afaf'>tests</a>/<a href='/guix/log/tests/challenge.scm?id=ea92d1df6376552b3ce7f16298c9cecfba19afaf'>challenge.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/tests/challenge.scm?id=ea92d1df6376552b3ce7f16298c9cecfba19afaf&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-01-16 11:51:03 +0000'>2021-01-16</span></td><td><a href='/guix/commit/tests/challenge.scm?id=681af17460fa34916ac40589cccdcca7222249af'>guix: Move narinfo code from substitute script to module.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>