diff --git a/pkgs/applications/version-management/subversion/default.nix b/pkgs/applications/version-management/subversion/default.nix
index e5940c939561..1b3c45ccb398 100644
--- a/pkgs/applications/version-management/subversion/default.nix
+++ b/pkgs/applications/version-management/subversion/default.nix
@@ -38,10 +38,6 @@ let
 
     patches = [ ./apr-1.patch ];
 
-    # SVN build seems broken on gcc5:
-    # https://gcc.gnu.org/gcc-5/porting_to.html
-    CPPFLAGS = "-P";
-
     configureFlags = [
       (stdenv.lib.withFeature bdbSupport "berkeley-db")
       (stdenv.lib.withFeatureAs httpServer "apxs" "${apacheHttpd.dev}/bin/apxs")
@@ -110,11 +106,6 @@ let
   });
 
 in {
-  subversion18 = common {
-    version = "1.8.19";
-    sha256 = "1gp6426gkdza6ni2whgifjcmjb4nq34ljy07yxkrhlarvfq6ks2n";
-  };
-
   subversion19 = common {
     version = "1.9.9";
     sha256 = "1ll13ychbkp367c7zsrrpda5nygkryma5k18qfr8wbaq7dbvxzcd";
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 57ba1ab44dcc..6bca75336b33 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20051,7 +20051,7 @@ in
     sublime-merge-dev;
 
   inherit (callPackages ../applications/version-management/subversion { sasl = cyrus_sasl; })
-    subversion18 subversion19 subversion_1_10 subversion_1_11;
+    subversion19 subversion_1_10 subversion_1_11;
 
   subversion = subversion_1_11;