diff -up ./geospatial.c.pr ./geospatial.c
--- ./geospatial.c.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./geospatial.c	2020-09-30 15:55:40.091268935 +0200
@@ -1,8 +1,8 @@
 /*
   +----------------------------------------------------------------------+
-  | PHP Version 5/7                                                      |
+  | PHP Version 5/7/8                                                    |
   +----------------------------------------------------------------------+
-  | Copyright (c) 1997-2016 The PHP Group                                |
+  | Copyright (c) 1997-2020 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
@@ -34,6 +34,11 @@
 #include "Zend/zend_exceptions.h"
 #include "ext/spl/spl_exceptions.h"
 
+#ifndef TSRMLS_CC
+#define TSRMLS_CC
+#define TSRMLS_DC
+#endif
+
 ZEND_BEGIN_ARG_INFO_EX(haversine_args, 0, 0, 2)
 	ZEND_ARG_INFO(0, geoJsonPointFrom)
 	ZEND_ARG_INFO(0, geoJsonPointTo)
@@ -450,7 +455,7 @@ geo_cartesian polar_to_cartesian(double
 geo_lat_long cartesian_to_polar(double x, double y, double z, geo_ellipsoid eli)
 {
 
-	double nu, lambda, h;
+	double nu = 0, lambda, h;
 	geo_lat_long polar;
 
 	/* aiming for 1m accuracy */
diff -up ./.gitignore.pr ./.gitignore
--- ./.gitignore.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./.gitignore	2020-09-30 15:54:31.215548030 +0200
@@ -15,6 +15,7 @@
 /config.sub
 /configure
 /configure.in
+/configure.ac
 /config.status
 /config.cache
 /conftest
diff -up ./tests/decimal_to_dms.phpt.pr ./tests/decimal_to_dms.phpt
--- ./tests/decimal_to_dms.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/decimal_to_dms.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -9,14 +9,14 @@ var_dump($dms);
 $dms = decimal_to_dms(-1.034291666667, 'latitude');
 var_dump($dms);
 ?>
---EXPECT--
+--EXPECTF--
 array(4) {
   ["degrees"]=>
   int(1)
   ["minutes"]=>
   int(2)
   ["seconds"]=>
-  float(3.4500000011994)
+  float(3.450000001199%s)
   ["direction"]=>
   string(1) "W"
 }
@@ -26,7 +26,7 @@ array(4) {
   ["minutes"]=>
   int(2)
   ["seconds"]=>
-  float(3.4500000011994)
+  float(3.450000001199%s)
   ["direction"]=>
   string(1) "S"
 }
diff -up ./tests/dms_to_decimal.phpt.pr ./tests/dms_to_decimal.phpt
--- ./tests/dms_to_decimal.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/dms_to_decimal.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -16,10 +16,10 @@ var_dump($decimal);
 $decimal = dms_to_decimal(74, 34, 31, 'W');
 var_dump($decimal);
 ?>
---EXPECT--
-float(-1.0342916666667)
-float(-2.3071388888889)
-float(-2.3071388888889)
-float(-2.3071388888889)
-float(-0.1025)
-float(-74.575277777778)
+--EXPECTF--
+float(-1.034291666666%s)
+float(-2.307138888888%s)
+float(-2.307138888888%s)
+float(-2.307138888888%s)
+float(-0.102%s)
+float(-74.57527777777%s)
diff -up ./tests/fraction_along-001.phpt.pr ./tests/fraction_along-001.phpt
--- ./tests/fraction_along-001.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/fraction_along-001.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -12,7 +12,7 @@ var_dump(fraction_along_gc_line($point1,
 var_dump(fraction_along_gc_line($point1, $point2, 0.8));
 var_dump(fraction_along_gc_line($point1, $point2, 1));
 ?>
---EXPECT--
+--EXPECTF--
 array(2) {
   ["type"]=>
   string(5) "Point"
@@ -30,9 +30,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(6.9998522347268)
+    float(6.999852234726%s)
     [1]=>
-    float(10.023944943799)
+    float(10.02394494379%s)
   }
 }
 array(2) {
@@ -41,9 +41,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(8.9999260791276)
+    float(8.999926079127%s)
     [1]=>
-    float(10.035925156339)
+    float(10.03592515633%s)
   }
 }
 array(2) {
@@ -52,9 +52,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(11.000073920872)
+    float(11.00007392087%s)
     [1]=>
-    float(10.035925156339)
+    float(10.03592515633%s)
   }
 }
 array(2) {
@@ -63,9 +63,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(13.000147765273)
+    float(13.00014776527%s)
     [1]=>
-    float(10.023944943799)
+    float(10.02394494379%s)
   }
 }
 array(2) {
@@ -74,7 +74,7 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(15)
+    float(1%s)
     [1]=>
     float(10)
   }
diff -up ./tests/fraction_along-002.phpt.pr ./tests/fraction_along-002.phpt
--- ./tests/fraction_along-002.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/fraction_along-002.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -7,15 +7,15 @@ $point2 = [ 'type' => 'Point', 'coordina
    
 var_dump(fraction_along_gc_line($point1, $point2, 0.5));
 ?>
---EXPECT--
+--EXPECTF--
 array(2) {
   ["type"]=>
   string(5) "Point"
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(1.5809481271999)
+    float(1.580948127199%s)
     [1]=>
-    float(53.743611334154)
+    float(53.74361133415%s)
   }
 }
diff -up ./tests/geohash_decode.phpt.pr ./tests/geohash_decode.phpt
--- ./tests/geohash_decode.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/geohash_decode.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -25,7 +25,7 @@ var_dump(geohash_decode('u2edjnw17enr'))
 
 var_dump(geohash_decode('zzzzzzzzzzzz'));
 ?>
---EXPECT--
+--EXPECTF--
 array(2) {
   ["type"]=>
   string(5) "Point"
@@ -87,9 +87,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.02966308594)
+    float(171.029663085%s)
     [1]=>
-    float(49.671936035156)
+    float(49.6719360351%s)
   }
 }
 array(2) {
@@ -98,9 +98,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.02897644043)
+    float(171.028976440%s)
     [1]=>
-    float(49.67399597168)
+    float(49.6739959716%s)
   }
 }
 array(2) {
@@ -109,9 +109,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.0284614563)
+    float(171.028461456%s)
     [1]=>
-    float(49.674081802368)
+    float(49.6740818023%s)
   }
 }
 array(2) {
@@ -120,9 +120,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.02861166)
+    float(171.0286116%s)
     [1]=>
-    float(49.674146175385)
+    float(49.67414617%s)
   }
 }
 array(2) {
@@ -131,9 +131,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.02859556675)
+    float(171.0285955667%s)
     [1]=>
-    float(49.674154222012)
+    float(49.67415422201%s)
   }
 }
 array(2) {
@@ -142,9 +142,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.0285962373)
+    float(171.028596237%s)
     [1]=>
-    float(49.674153551459)
+    float(49.67415355145%s)
   }
 }
 array(2) {
@@ -153,9 +153,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(171.02859674022)
+    float(171.0285967402%s)
     [1]=>
-    float(49.674154138193)
+    float(49.67415413819%s)
   }
 }
 array(2) {
@@ -186,9 +186,9 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(16.40000006184)
+    float(16.4000000618%s)
     [1]=>
-    float(48.199999993667)
+    float(48.19999999366%s)
   }
 }
 array(2) {
@@ -197,8 +197,8 @@ array(2) {
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(179.99999983236)
+    float(179.9999998323%s)
     [1]=>
-    float(89.999999916181)
+    float(89.99999991618%s)
   }
 }
diff -up ./tests/Greenwich.phpt.pr ./tests/Greenwich.phpt
--- ./tests/Greenwich.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/Greenwich.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -25,16 +25,16 @@ var_dump($polar);
 echo round($diferenceWGS84, 8),PHP_EOL;
 echo round($diferenceAiry, 8),PHP_EOL;
 ?>
---EXPECT--
+--EXPECTF--
 array(2) {
   ["type"]=>
   string(5) "Point"
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(0.00013627354767069)
+    float(0.0001362735476706%s)
     [1]=>
-    float(51.477400823311)
+    float(51.47740082331%s)
   }
 }
 102.84185171
diff -up ./tests/helmert.phpt.pr ./tests/helmert.phpt
--- ./tests/helmert.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/helmert.phpt	2020-09-30 15:54:31.215548030 +0200
@@ -8,12 +8,12 @@ $z = 5020322.478;
 
 var_dump(helmert($x, $y, $z));
 ?>
---EXPECT--
+--EXPECTF--
 array(3) {
   ["x"]=>
-  float(3909460.0676711)
+  float(3909460.067671%s)
   ["y"]=>
-  float(-146987.30138174)
+  float(-146987.301381%s)
   ["z"]=>
-  float(5019888.0705933)
+  float(5019888.070593%s)
 }
diff -up ./tests/initial_bearing1.phpt.pr ./tests/initial_bearing1.phpt
--- ./tests/initial_bearing1.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/initial_bearing1.phpt	2020-09-30 15:54:31.216548027 +0200
@@ -14,5 +14,5 @@ $to = array(
 );
 var_dump(initial_bearing($from, $to));
 ?>
---EXPECT--
-float(148.270892801715)
+--EXPECTF--
+float(148.27089280171%s)
diff -up ./tests/initial_bearing2.phpt.pr ./tests/initial_bearing2.phpt
--- ./tests/initial_bearing2.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/initial_bearing2.phpt	2020-09-30 15:54:31.216548027 +0200
@@ -14,5 +14,5 @@ $to = array(
 );
 var_dump(initial_bearing($from, $to));
 ?>
---EXPECT--
-float(337.890440190492)
+--EXPECTF--
+float(337.89044019049%s)
diff -up ./tests/JodrellBank.phpt.pr ./tests/JodrellBank.phpt
--- ./tests/JodrellBank.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/JodrellBank.phpt	2020-09-30 15:54:31.216548027 +0200
@@ -12,15 +12,15 @@ $polar = transform_datum($from, GEO_WGS8
 
 var_dump($polar);
 ?>
---EXPECT--
+--EXPECTF--
 array(2) {
   ["type"]=>
   string(5) "Point"
   ["coordinates"]=>
   array(2) {
     [0]=>
-    float(-2.3057171628534)
+    float(-2.305717162853%s)
     [1]=>
-    float(53.235974015543)
+    float(53.23597401554%s)
   }
 }
diff -up ./tests/OSGB36_to_WGS84.phpt.pr ./tests/OSGB36_to_WGS84.phpt
--- ./tests/OSGB36_to_WGS84.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/OSGB36_to_WGS84.phpt	2020-09-30 15:54:31.216548027 +0200
@@ -13,14 +13,14 @@ $polar = transform_datum($from, GEO_AIRY
 var_dump(decimal_to_dms($polar['coordinates'][1], 'latitude'));
 var_dump(decimal_to_dms($polar['coordinates'][0] ,'longitude'));
 ?>
---EXPECT--
+--EXPECTF--
 array(4) {
   ["degrees"]=>
   int(53)
   ["minutes"]=>
   int(14)
   ["seconds"]=>
-  float(11.493372672732)
+  float(11.49337267273%s)
   ["direction"]=>
   string(1) "N"
 }
@@ -30,7 +30,7 @@ array(4) {
   ["minutes"]=>
   int(18)
   ["seconds"]=>
-  float(30.817794659248)
+  float(30.81779465924%s)
   ["direction"]=>
   string(1) "W"
 }
diff -up ./tests/polar_to_cartesian.phpt.pr ./tests/polar_to_cartesian.phpt
--- ./tests/polar_to_cartesian.phpt.pr	2019-01-08 12:37:40.000000000 +0100
+++ ./tests/polar_to_cartesian.phpt	2020-09-30 15:54:31.216548027 +0200
@@ -7,12 +7,12 @@ $long = 1.4669444444;
 
 var_dump(polar_to_cartesian($lat, $long, GEO_AIRY_1830));
 ?>
---EXPECT--
+--EXPECTF--
 array(3) {
   ["x"]=>
-  float(3810891.6734396)
+  float(3810891.673439%s)
   ["y"]=>
-  float(97591.624686311)
+  float(97591.62468631%s)
   ["z"]=>
-  float(5095766.3939034)
+  float(5095766.393903%s)
 }