--- src/s2/s2edge_crossings.cc.orig	2023-04-28 23:28:39.000000000 +0800
+++ src/s2/s2edge_crossings.cc	2023-05-18 18:05:32.000000000 +0800
@@ -116,7 +116,7 @@
   // "a" and "b" are closer than about 18 * DBL_ERR == 9 * DBL_EPSILON.
   // (80-bit precision can handle inputs as close as 2.5 * LDBL_EPSILON.)
   constexpr T T_ERR = rounding_epsilon<T>();
-  constexpr T kMinNorm =
+  const T kMinNorm =
       (32 * kSqrt3 * DBL_ERR) /
       (kRobustCrossProdError.radians() / T_ERR - (1 + 2 * kSqrt3));
 
@@ -459,7 +459,7 @@
 
   constexpr T T_ERR = rounding_epsilon<T>();
   constexpr T kMinNormalLength = (16 * kSqrt3 + 24) * DBL_ERR;
-  constexpr T kMinResultLen =
+  const T kMinResultLen =
       12 / (kIntersectionError.radians() / T_ERR - (2 + 2 * kSqrt3));
 
   // On some platforms "long double" is the same as "double", and on these

--- src/s2/s2predicates.cc.orig	2023-04-28 23:28:39.000000000 +0800
+++ src/s2/s2predicates.cc	2023-05-19 01:05:41.000000000 +0800
@@ -932,7 +932,7 @@
   // Reference:
   //   Error Estimation Of Floating-Point Summation And Dot Product, Rump
   //   2011
-  constexpr T kMaxError = 3.046875 * std::numeric_limits<T>::epsilon();
+  const T kMaxError = 3.046875 * std::numeric_limits<T>::epsilon();
 
   T na = a.DotProd(b);
   if (std::fabs(na) <= kMaxError) return 0;