diff --git a/build.zig b/build.zig
index 427a51e..c121bea 100644
--- a/build.zig
+++ b/build.zig
@@ -58,12 +58,12 @@ const LibreSslLibs = struct {
             }
 
             if (std.mem.endsWith(u8, child.basename, ".h")) {
-                const full = try std.mem.concat(b.allocator, u8, &.{ base, child.path });
-                defer b.allocator.free(full);
+                const full = b.pathJoin(&.{ base, child.path });
 
-                self.libcrypto.installHeader(full, child.path);
-                self.libssl.installHeader(full, child.path);
-                self.libtls.installHeader(full, child.path);
+                const path = b.path(full);
+                self.libcrypto.installHeader(path, child.path);
+                self.libssl.installHeader(path, child.path);
+                self.libtls.installHeader(path, child.path);
             }
         }
     }
@@ -229,14 +229,19 @@ pub fn libresslBuild(
         else => @panic("unsupported target OS"),
     }
 
-    const conf_header = switch (tinfo.cpu.arch) {
+    const conf_header = b.path(switch (tinfo.cpu.arch) {
         .aarch64, .aarch64_be, .aarch64_32 => source_header_prefix ++ "arch/aarch64/opensslconf.h",
         .x86 => source_header_prefix ++ "arch/i386/opensslconf.h",
         .riscv64 => source_header_prefix ++ "arch/riscv64/opensslconf.h",
         .x86_64 => source_header_prefix ++ "arch/amd64/opensslconf.h",
 
         else => @panic("unsupported target CPU arch"),
-    };
+    });
+
+    const install_conf = b.addInstallHeaderFile(conf_header, "openssl/opensslconf.h");
+    libressl_libs.libcrypto.step.dependOn(&install_conf.step);
+    libressl_libs.libssl.step.dependOn(&install_conf.step);
+    libressl_libs.libtls.step.dependOn(&install_conf.step);
 
     libressl_libs.libcrypto.installHeader(conf_header, "openssl/opensslconf.h");
     libressl_libs.libssl.installHeader(conf_header, "openssl/opensslconf.h");