diff --git a/0001-fplll-fix-namespace-issue.patch b/0001-fplll-fix-namespace-issue.patch
new file mode 100644
index 0000000..cbc53d9
--- /dev/null
+++ b/0001-fplll-fix-namespace-issue.patch
@@ -0,0 +1,49 @@
+From f952fd99fc1b6934708ae64cbe92ec1c1ec4e419 Mon Sep 17 00:00:00 2001
+From: Jerome Benoit <quartermaster@rezozer.net>
+Date: Sun, 3 Jul 2022 17:11:31 +0200
+Subject: [PATCH] fplll: fix namespace issue
+
+Description: fix fplll namespace issue
+ Upstream maintainer of FPLLL has removed from `root` fplll.h
+ 'using namespace fplll' (commit e886a8899f71ca78711fdf420e6817432b2fe4be),
+ this patch mimics the former behviour at the scale of this package.
+Origin: vendor, Debian
+Author: Jerome Benoit <calculus@rezozer.net>
+Last-Update: 2022-07-03
+---
+ m4/ac_check_fplll.m4 | 5 ++++-
+ src/fplll.C          | 2 ++
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/m4/ac_check_fplll.m4 b/m4/ac_check_fplll.m4
+index a6e2945..224f87c 100644
+--- a/m4/ac_check_fplll.m4
++++ b/m4/ac_check_fplll.m4
+@@ -68,7 +68,10 @@ if test "$found_fplll" = false; then
+     AX_CXX_COMPILE_STDCXX([11],[noext],[mandatory])
+     AC_CHECK_HEADER(fplll.h,[found_fplll=true],[found_fplll=false],[#include <mpfr.h>])
+     AC_MSG_CHECKING([for lllReduction in -fplll (version 5.x)])
+-    AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <fplll.h>],[ZZ_mat<mpz_t> M(3,3);lll_reduction(M, 0.99, 0.51, LM_WRAPPER);])],[AC_MSG_RESULT([yes]);found_fplll=5],[AC_MSG_RESULT([no]);found_fplll=false])
++    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
++#include <fplll.h>
++using namespace fplll;
++]],[ZZ_mat<mpz_t> M(3,3);lll_reduction(M, 0.99, 0.51, LM_WRAPPER);])],[AC_MSG_RESULT([yes]);found_fplll=5],[AC_MSG_RESULT([no]);found_fplll=false])
+ fi
+ AC_LANG_POP([C++])
+ 
+diff --git a/src/fplll.C b/src/fplll.C
+index 45241c2..832c7b1 100644
+--- a/src/fplll.C
++++ b/src/fplll.C
+@@ -23,6 +23,8 @@
+ #include "floattypes.h"
+ 
+ #include <fplll.h>
++using namespace fplll;
++
+ 
+ typedef Obj (*ObjFunc)(); // I never could get the () and * right
+ 
+-- 
+2.38.1
+
diff --git a/gap-float.changes b/gap-float.changes
index 23703c3..92f5bd0 100644
--- a/gap-float.changes
+++ b/gap-float.changes
@@ -3,6 +3,7 @@ Sun Nov 27 23:28:35 UTC 2022 - Jan Engelhardt <jengelh@inai.de>
 
 - Update to release 1.0.3
   * No changelog was provided
+- Add 0001-fplll-fix-namespace-issue.patch
 
 -------------------------------------------------------------------
 Wed Nov 14 22:05:01 UTC 2018 - Jan Engelhardt <jengelh@inai.de>
diff --git a/gap-float.spec b/gap-float.spec
index 0923f59..eaf7a64 100644
--- a/gap-float.spec
+++ b/gap-float.spec
@@ -25,6 +25,7 @@ Group:          Productivity/Scientific/Math
 URL:            https://gap-packages.github.io/float/
 #Git-Clone:	https://github.com/gap-packages/float
 Source:         https://github.com/gap-packages/float/releases/download/v%version/float-%version.tar.gz
+Patch1:         0001-fplll-fix-namespace-issue.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  gap-devel >= 4.11
@@ -34,7 +35,7 @@ BuildRequires:  libtool
 BuildRequires:  mpc-devel
 BuildRequires:  mpfi-devel
 BuildRequires:  mpfr-devel
-BuildRequires:  pkgconfig(fplll)
+BuildRequires:  pkgconfig(fplll) >= 5
 Requires:       gap-core >= 4.11
 Requires:       gap-gapdoc >= 1.0
 
@@ -44,12 +45,11 @@ with arbitrary precision. It is based on MPFR, MPFI, MPC, CXSC,
 FPLLL.
 
 %prep
-%autosetup -n float-%version
+%autosetup -n float-%version -p1
 
 %build
 autoreconf -fi
-%configure --with-gaproot="%gapdir" --without-fplll --without-cxsc
-# fplll is too new
+%configure --with-gaproot="%gapdir" --without-cxsc
 %make_build
 
 %install