Package: libgsl-dev
Version: 2.6+dfsg-2
Severity: normal

Dear Maintainer,

   * What led up to the situation?
#include <stdio.h>
#include <gsl/gsl_cdf.h> // for the cummulative beta distribution 
gsl_cdf_beta_Q()

int
main (void)
{
  double lowerbound = gsl_cdf_beta_Q(0.003, 12093.0, 3602.0);  
  printf ("%.18e\n", lowerbound);
  return 0;
}

failed to converge

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

I applied a patch supplied upstream http://savannah.gnu.org/bugs/?45924, 
recompiled gsl and recompiled the above program

   * What was the outcome of this action?

7.649597002136596657e-01


-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.6.0-1-amd64 (SMP w/2 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, 
TAINT_UNSIGNED_MODULE
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to 
sv_SE.utf8), LANGUAGE=C.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to 
sv_SE.utf8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libgsl-dev depends on:
ii  libgsl25      2.6+dfsg-2
ii  libgslcblas0  2.6+dfsg-2

libgsl-dev recommends no packages.

libgsl-dev suggests no packages.

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