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-rw-r--r--gnu/packages/algebra.scm5
-rw-r--r--gnu/packages/patches/fplll-std-fenv.patch18
2 files changed, 21 insertions, 2 deletions
diff --git a/gnu/packages/algebra.scm b/gnu/packages/algebra.scm
index 56a9a65366..16a1853483 100644
--- a/gnu/packages/algebra.scm
+++ b/gnu/packages/algebra.scm
@@ -160,14 +160,15 @@ line applications.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "06nyfidagp8pc2kfcw88ldgb2b1xm0a8z31n0sln7j72ihlmd8zj"))))
+                "06nyfidagp8pc2kfcw88ldgb2b1xm0a8z31n0sln7j72ihlmd8zj"))
+              (patches (search-patches "fplll-std-fenv.patch"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("autoconf" ,autoconf)
        ("automake" ,automake)
        ("libtool" ,libtool)
        ("pkg-config" ,pkg-config)))
-    (inputs
+    (propagated-inputs ; header files pulled in by fplll/defs.h
      `(("gmp" ,gmp)
        ("mpfr" ,mpfr)))
     (home-page "https://github.com/fplll/fplll")
diff --git a/gnu/packages/patches/fplll-std-fenv.patch b/gnu/packages/patches/fplll-std-fenv.patch
new file mode 100644
index 0000000000..aa2438f0c9
--- /dev/null
+++ b/gnu/packages/patches/fplll-std-fenv.patch
@@ -0,0 +1,18 @@
+See https://github.com/fplll/fplll/issues/444
+
+--- fplll-5.3.3-checkout.old/fplll/enum/enumerate_base.h	2020-09-23 13:55:27.833769823 +0200
++++ fplll-5.3.3-checkout/fplll/enum/enumerate_base.h	2020-09-23 13:56:14.313771769 +0200
+@@ -127,10 +127,10 @@
+   int rounding_backup;
+   void save_rounding()
+   {
+-    rounding_backup = std::fegetround();
+-    std::fesetround(FE_TONEAREST);
++    rounding_backup = fegetround();
++    fesetround(FE_TONEAREST);
+   }
+-  void restore_rounding() { std::fesetround(rounding_backup); }
++  void restore_rounding() { fesetround(rounding_backup); }
+ 
+   inline bool next_pos_up()
+   {