diff --git a/packages/autoconf.shrap b/packages/autoconf.shrap
new file mode 100644
index 0000000..e652fa2
--- /dev/null
+++ b/packages/autoconf.shrap
@@ -0,0 +1,11 @@
+(package
+    (name "autoconf")
+    (version "2.72")
+    (homepage "https://www.gnu.org/software/autoconf/")
+    (dependencies m4 perl)
+    (src (tar
+        (url "https://ftp.gnu.org/gnu/autoconf/autoconf-2.72.tar.gz")
+        (dir "autoconf-2.72")
+        (blake3 "89aad7032c61efa3ea6cada364e20560c58441a92a7267db15e0fddff55638c7")))
+    (build
+        (configure_make)))
diff --git a/packages/automake.shrap b/packages/automake.shrap
new file mode 100644
index 0000000..482450c
--- /dev/null
+++ b/packages/automake.shrap
@@ -0,0 +1,11 @@
+(package
+    (name "automake")
+    (version "1.18")
+    (homepage "https://www.gnu.org/software/automake/")
+    (dependencies m4)
+    (src (tar
+        (url "https://ftp.gnu.org/gnu/automake/automake-1.18.tar.gz")
+        (dir "automake-1.18")
+        (blake3 "42458b6c690f6bf69d9dece26b023a7437830333e9149a13ab165f34ecbe90a3")))
+    (build
+        (configure_make)))
diff --git a/packages/bison.shrap b/packages/bison.shrap
new file mode 100644
index 0000000..426c22c
--- /dev/null
+++ b/packages/bison.shrap
@@ -0,0 +1,11 @@
+(package
+    (name "bison")
+    (version "3.8.2")
+    (homepage "https://www.gnu.org/software/bison/")
+    (dependencies m4)
+    (src (tar
+        (url "https://ftp.gnu.org/gnu/bison/bison-3.8.2.tar.gz")
+        (dir "bison-3.8.2")
+        (blake3 "9a529d3945d46103faa144ad1998b6c7dcf4653166fceee1ef59baef3c853c34")))
+    (build
+        (configure_make)))
diff --git a/packages/flex.shrap b/packages/flex.shrap
new file mode 100644
index 0000000..018964e
--- /dev/null
+++ b/packages/flex.shrap
@@ -0,0 +1,11 @@
+(package
+    (name "flex")
+    (version "2.6.4")
+    (homepage "https://github.com/westes/flex")
+    (dependencies m4)
+    (src (tar
+        (url "https://github.com/westes/flex/releases/download/v2.6.4/flex-2.6.4.tar.gz")
+        (dir "flex-2.6.4")
+        (blake3 "d78b714ac38bd9de7f9b44a078efed82e96ed43e7cf9cd33944a7f379a2d09a4")))
+    (build
+        (configure_make)))
diff --git a/packages/libglib.shrap b/packages/libglib.shrap
index 931e266..b7dd711 100644
--- a/packages/libglib.shrap
+++ b/packages/libglib.shrap
@@ -1,5 +1,5 @@
 (package
-    (name "glib")
+    (name "libglib")
     (version "2.86.4")
     (homepage "https://www.gtk.org/")
     (dependencies meson ninja git libffi pkg-config slang)
diff --git a/packages/libreadline.shrap b/packages/libreadline.shrap
new file mode 100644
index 0000000..e1fd355
--- /dev/null
+++ b/packages/libreadline.shrap
@@ -0,0 +1,12 @@
+(package
+    (name "libreadline")
+    (version "8.3")
+    (homepage "https://tiswww.cwru.edu/php/chet/readline/rltop.html")
+    (dependencies libncurses)
+    (src (tar
+        (url "https://ftp.gnu.org/gnu/readline/readline-8.3.tar.gz")
+        (dir "readline-8.3")
+        (blake3 "7109f094062bda387a0c16b4875375b96e36437bebbbd8d8f91bb27ba01d687f")))
+    (build
+        (configure_make
+            (configure_flags "--disable-shared"))))
diff --git a/packages/pkg-config.shrap b/packages/pkg-config.shrap
index 36e2124..2044fe1 100644
--- a/packages/pkg-config.shrap
+++ b/packages/pkg-config.shrap
@@ -2,6 +2,7 @@
     (name "pkg-config")
     (version "2.5.1")
     (homepage "https://github.com/pkgconf/pkgconf")
+    (dependencies xz)
     (src (tar
         (url "https://distfiles.ariadne.space/pkgconf/pkgconf-2.5.1.tar.xz")
         (dir "pkgconf-2.5.1")
diff --git a/packages/postgresql.shrap b/packages/postgresql.shrap
new file mode 100644
index 0000000..fe63309
--- /dev/null
+++ b/packages/postgresql.shrap
@@ -0,0 +1,12 @@
+(package
+    (name "postgresql")
+    (version "18.2")
+    (homepage "https://www.postgresql.org/")
+    (dependencies pkg-config bison flex perl libreadline zlib)
+    (src (tar
+        (url "https://ftp.postgresql.org/pub/source/v18.2/postgresql-18.2.tar.gz")
+        (dir "postgresql-18.2")
+        (blake3 "ae352f4fecabf9ada3fe22e46f952507d6970864b6f9494d7a7e3b65bd009463")))
+    (build
+        (configure_make
+            (configure_flags "--without-icu"))))
diff --git a/packages/psmisc.shrap b/packages/psmisc.shrap
new file mode 100644
index 0000000..6067dce
--- /dev/null
+++ b/packages/psmisc.shrap
@@ -0,0 +1,12 @@
+(package
+    (name "psmisc")
+    (version "23.7")
+    (homepage "https://gitlab.com/psmisc/psmisc")
+    (dependencies autoconf automake gettext libncurses)
+    (src (tar
+        (url "https://gitlab.com/psmisc/psmisc/-/archive/v23.7/psmisc-v23.7.tar.gz")
+        (dir "psmisc-v23.7")
+        (blake3 "3e213023c51dfcbbad4f51af77c8488d5ff5ee6f8bd08fa1ede77ae6ac56f7a5")))
+    (build
+        (shell "./autogen.sh")
+        (configure_make)))
diff --git a/packages/python.shrap b/packages/python.shrap
index 8f9a38a..2f26cb4 100644
--- a/packages/python.shrap
+++ b/packages/python.shrap
@@ -1,5 +1,5 @@
 (package
-    (name "python3")
+    (name "python")
     (version "3.14.3")
     (homepage "https://www.python.org/")
     (dependencies zlib libopenssl bzip2)
diff --git a/src/main.cc b/src/main.cc
index afd3536..64767d6 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,31 +1,76 @@
 #include "parser.h"
 #include "util.h"
+#include <filesystem>
+#include <functional>
 #include <span>
 #include <sys/stat.h>
 #include <thread>
+#include <unordered_map>
 
-static bool flag_raw = false;
+std::unordered_map<std::string, Expr> packages;
+bool flag_raw = false;
 
-void install_package(const std::string &name) {
-  // TODO: get this by the name field not filename
-  // TODO: actually resolve dependency tree
-  // TODO: track installed packages
-  std::ifstream file("packages/" + name + ".shrap");
-  if (!file) {
-    std::cerr << "Package " << name << "not found.\n";
-    std::exit(1);
+void load_packages() {
+  for (const auto &e : std::filesystem::directory_iterator("./packages/")) {
+    std::ifstream file(e.path());
+    if (!file) {
+      std::cerr << "Failed to open " << e.path() << "\n";
+      std::exit(1);
+    }
+
+    Expr pkg = Expr::parse(file);
+    packages[pkg.get_one("name").value] = pkg;
   }
+}
 
-  Expr pkg = Expr::parse(file);
+std::vector<std::string>
+resolve_dependencies(const std::vector<std::string> &roots) {
+  std::unordered_map<std::string, int> state;
+  std::vector<std::string> order;
+
+  std::function<void(const std::string &)> dfs = [&](const std::string &name) {
+    int s = state[name];
+    if (s == 2) {
+      return;
+    }
+    if (s == 1) {
+      throw std::runtime_error("dependency cycle detected");
+    }
+
+    if (!packages.contains(name)) {
+      std::cerr << "Package not found: " << name << "\n";
+      std::exit(1);
+    }
+
+    state[name] = 1;
 
-  if (!flag_raw) {
     try {
+      const Expr &pkg = packages.at(name);
       for (const auto &dep : pkg.get("dependencies").children) {
-        install_package(dep.value);
+        dfs(dep.value);
       }
     } catch (std::out_of_range &) {
     }
+
+    state[name] = 2;
+    order.push_back(name);
+  };
+
+  for (const auto &r : roots) {
+    dfs(r);
   }
+  return order;
+}
+
+void install_package(const std::string &name) {
+  // TODO: track installed packages
+
+  if (!packages.contains(name)) {
+    std::cerr << "Package not found: " << name << "\n";
+    std::exit(1);
+  }
+
+  Expr pkg = packages[name];
 
   std::cout << "\n\n\tInstalling " << pkg.get_one("name").value << " ("
             << pkg.get_one("version").value << ")...\n\n\n";
@@ -123,22 +168,34 @@ int main(int argc, char **argv) {
   }
   Util::shell_command("mkdir -p /tmp/shrap");
 
-  std::vector<std::string> packages;
+  load_packages();
+
+  std::vector<std::string> to_install;
   for (size_t i = 1; i < args.size(); ++i) {
     std::string arg = args[i];
     if (arg == "-r") {
       flag_raw = true;
     } else {
-      packages.push_back(arg);
+      to_install.push_back(arg);
     }
   }
 
-  if (packages.empty()) {
+  if (to_install.empty()) {
     std::cerr << "Usage: " << args[0] << " [-r] package1 [package2 ...]\n";
     return 1;
   }
 
-  for (const auto &pkg : packages) {
+  if (!flag_raw) {
+    to_install = resolve_dependencies(to_install);
+  }
+
+  std::cout << "\nFollowing packages will be installed:\n";
+  for (const std::string &pkg : to_install) {
+    std::cout << " - " << pkg << std::endl;
+  }
+  std::cin.get();
+
+  for (const std::string &pkg : to_install) {
     try {
       install_package(pkg);
     } catch (std::exception &e) {