I figured out what the problem was. I was an idiot in many ways :

- the submodule had an invalid detatched head commit hash. Dunno why.
- the package swift file defined a wrong version number for libmaxminddb. Moral of the story : don't be an ass.
- some leftover garbage from automake made me believe I was done
- potato

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "libmaxminddb"]
-	path = libmaxminddb
-	url = https://github.com/maxmind/libmaxminddb
 [submodule "Sources/libmaxminddb"]
 	path = Sources/libmaxminddb
 	url = https://github.com/maxmind/libmaxminddb

.idea/..iml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="." external.linked.project.path="$MODULE_DIR$/./." external.root.project.path="$MODULE_DIR$" external.system.id="SPM" type="CPP_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

@@ -2,6 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
+      <module fileurl="file://$PROJECT_DIR$/../../.idea/..iml" filepath="$PROJECT_DIR$/../../.idea/..iml" />
       <module fileurl="file://$PROJECT_DIR$/.idea/GeoIP2-swift.iml" filepath="$PROJECT_DIR$/.idea/GeoIP2-swift.iml" />
     </modules>
   </component>

.idea/vcs.xml

@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/Sources/libmaxminddb" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/Sources/libmaxminddb/t/libtap" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/Sources/libmaxminddb/t/maxmind-db" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
     <mapping directory="$PROJECT_DIR$/libmaxminddb" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/../../Sources/libmaxminddb" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/../../Sources/libmaxminddb/t/libtap" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/../../Sources/libmaxminddb/t/maxmind-db" vcs="Git" />
   </component>
 </project>

Package.swift

@@ -36,8 +36,16 @@ let package = Package(
     ),
 
     .target(
-      name: "libmaxminddb",
+      name: "libmaxminddb_config",
       dependencies: [],
+      path: "Sources/libmaxminddb_config",
+      sources: ["./src/"],
+      publicHeadersPath: "./include/"
+    ),
+
+    .target(
+      name: "libmaxminddb",
+      dependencies: ["libmaxminddb_config"],
       path: "Sources/libmaxminddb",
       exclude: [
         "./autom4te.cache/",
@@ -50,7 +58,7 @@ let package = Package(
       ],
       sources: ["./src/"],
       publicHeadersPath: "./include/",
-      cSettings: [CSetting.define("PACKAGE_VERSION", to: "\"1.4.2\"")]
+      cSettings: [CSetting.define("PACKAGE_VERSION", to: "\"1.3.2\"")]
     ),
 
     .testTarget(

README.md

@@ -8,6 +8,13 @@ Inspiration, and initial state of repository from
 [lexrus's](https://github.com/lexrus) [MMDB-Swift](https://github.com/lexrus/MMDB-Swift) 
 repository.
 
+## Disclaimers
+
+1. I'm no C guru.
+2. I'm no Swift guru.
+3. I have no idea what I'm doing.
+4. For my purposes the lib' works as is, but be super cautious because of items 1-3.
+
 ## Version Infos
 
 ### 1. [libmaxminddb](https://github.com/maxmind/libmaxminddb) : [1.3.2](https://github.com/maxmind/libmaxminddb/releases/tag/1.3.2)

Sources/libmaxminddb

@@ -1 +0,0 @@
-Subproject commit 2e2117f98efe3c47038daf072b755198c01bee63

Sources/libmaxminddb_config/README.md

@@ -0,0 +1,24 @@
+# libmaxminddb_config
+
+## Why this module exists?
+
+[libmaxminddb](https://github.com/maxmind/libmaxminddb) is build using 
+[automake](https://www.gnu.org/software/automake/).  
+The tool 
+[autoreconf](https://www.gnu.org/software/autoconf/manual/autoconf-2.68/html_node/autoreconf-Invocation.html)
+ran as `autoreconf -fiv` will generate the
+[configure script](https://developer.gnome.org/anjuta-build-tutorial/stable/create-autotools.html.en)
+necessary for building libmaxminddb, which will also produce a configuration 
+header file called `maxminddb_config.h`.
+
+In order for us to keep the library decoupled, as a git submodule, we need a way 
+to either build the project via Swift Package Manager, either inject a 
+configuration header file. At the time of writing **Swift Package Manager** is 
+not able to solve this problem, so we need to opt in to some automated injection.
+
+This is where this clumsy module comes into play.
+
+## Redundant definitions in header & c file
+
+I know.  
+Sadly there was no way around via Swift Package Manager at the time of writing. 

Sources/libmaxminddb_config/src/maxminddb_config.c

@@ -0,0 +1,15 @@
+/* include/maxminddb_config.h.  Generated from maxminddb_config.h.in by configure.  */
+#ifndef MAXMINDDB_CONFIG_H
+#define MAXMINDDB_CONFIG_H
+
+#ifndef MMDB_UINT128_USING_MODE
+/* Define as 1 if we we use unsigned int __atribute__ ((__mode__(TI))) for uint128 values */
+#define MMDB_UINT128_USING_MODE 0
+#endif
+
+#ifndef MMDB_UINT128_IS_BYTE_ARRAY
+/* Define as 1 if we don't have an unsigned __int128 type */
+#define MMDB_UINT128_IS_BYTE_ARRAY 0
+#endif
+
+#endif                          /* MAXMINDDB_CONFIG_H */

Sources/libmaxminddb_helper/README.md

@@ -0,0 +1,45 @@
+# libmaxminddb_helper
+
+## Why this module exists?
+
+**There are 2 reasons :** 
+* maxminddb_typecast.c & h
+* maxminddb-compat-util.h
+
+## maxminddb_typecast.c
+
+Since [libmaxminddb](https://github.com/maxmind/libmaxminddb) operates with all 
+sorts of pointer tricks, it's not too comfortable to acquire results from the C 
+API in Swift. So we need a simple solution to represent these values in a more 
+digestible way.
+
+Kudos once again go to [lexrus](https://github.com/lexrus)'s 
+[MMDB-Swift](https://github.com/lexrus/MMDB-Swift) where this whole repository
+started from. Original sources : 
+* [maxminddb_unions.c](https://github.com/lexrus/MMDB-Swift/blob/639b0d811694a27eab6cc6834a968888f666972d/Sources/libmaxminddb/maxminddb_unions.c)
+* [maxminddb_unions.h](https://github.com/lexrus/MMDB-Swift/blob/639b0d811694a27eab6cc6834a968888f666972d/Sources/libmaxminddb/maxminddb_unions.h) 
+
+## maxminddb-compat-util.h
+
+Again, another case of "I have no idea what I'm doing 🙂". Sorry.  
+So, [libmaxminddb](https://github.com/maxmind/libmaxminddb) depends on a few 
+functions which are included in its source, however Swift Package Manager for 
+whatever reason couldn't resolve it. I assume it's because the header file is in 
+the `src` directory, and so far I had the impression, that Swift Package Manager 
+(quite rightfully) prefers to keep things separated.
+
+Anyho', it's here, and it compiles. There's another catch though. Why do I have 
+only a header file and in the include dir. Another case of 
+**I have no idea what I'm doing**. When I separated the definitions from the 
+source in seperate C and header files, compilation failed with only one function 
+definition being undefined (which isn't undefined imho...)
+
+```
+Undefined symbols for architecture x86_64:
+  "_mmdb_strndup", referenced from:
+      _$s6GeoIP2AAC9getString024_01864207E763388F378F6E4G7DD973A2LLySSSpySo22MMDB_entry_data_list_sVGF in GeoIP2.swift.o
+ld: symbol(s) not found for architecture x86_64
+```
+
+In its current state it helps [libmaxminddb](https://github.com/maxmind/libmaxminddb)
+compile.

Tests/GeoIP2Tests/GeoIP2Tests.swift

@@ -24,11 +24,12 @@ class GeoIP2Tests: XCTestCase {
     XCTAssertEqual(database.lookup("8.8.8.8")?.isoCode, "US")
     XCTAssertEqual(database.lookup("8.8.4.4")?.isoCode, "US")
 
-    XCTAssertNotNil(database.lookup(IPOfHost("youtube.com")!))
-    XCTAssertNotNil(database.lookup(IPOfHost("facebook.com")!))
-    XCTAssertNotNil(database.lookup(IPOfHost("twitter.com")!))
-    XCTAssertNotNil(database.lookup(IPOfHost("instagram.com")!))
-    XCTAssertNotNil(database.lookup(IPOfHost("google.com")!))
+    XCTAssertNotNil(database.lookup("80.99.18.166"))
+    XCTAssertNotNil(database.lookup("172.217.18.78"))
+    XCTAssertNotNil(database.lookup("31.13.84.36"))
+    XCTAssertNotNil(database.lookup("104.244.42.129"))
+    XCTAssertNotNil(database.lookup("52.86.229.116"))
+    XCTAssertNotNil(database.lookup("172.217.19.110"))
   }
 
   func testCloudFlare() {