diff --git a/Makefile b/Makefile
index bae3b09..836f7df 100644
--- a/Makefile
+++ b/Makefile
@@ -61,6 +61,7 @@ NIM_OPTIONS = \
 	--putenv:'PROG_LOCALSTATEDIR'="${LOCALSTATEDIR}" \
 	--putenv:'PROG_SYSCONFDIR'="${SYSCONFDIR}" \
 	-d:'${NIM_TARGET}' \
+#	-d:nimPreviewSlimSystem \
 	--opt:'${NIM_OPTIMIZE}' \
 	--hint'[Conf]':off \
 	--hint'[Processing]':off \
diff --git a/lib/install.nim b/lib/install.nim
index 2a89ade..9ac38cf 100644
--- a/lib/install.nim
+++ b/lib/install.nim
@@ -1,5 +1,6 @@
 import
   os, posix, sequtils, strutils, sugar
+when not declared(system.stdout): import std/syncio
 
 proc splitCommands(params: seq[string], index: int, res: seq[seq[string]]): seq[seq[string]] =
   if index < params.len:
@@ -68,7 +69,7 @@ proc handleInstall*(params: seq[string]): int =
         let dest = destination & "/" & name
         copyFile(pkg.file, dest)
         discard chown(cstring(dest), (Uid) uid, (Gid) gid)
-      except:
+      except CatchableError:
         discard
 
   let asexplicit = install.filter(p => p.mode == "explicit").map(p => p.name)
diff --git a/src/args.nim b/src/args.nim
index deabeff..a465b7f 100644
--- a/src/args.nim
+++ b/src/args.nim
@@ -1,6 +1,7 @@
 import
   options, os, posix, sequtils, sets, strutils, sugar,
   utils
+when not declared(system.stdout): import std/syncio
 
 type
   ArgumentType* {.pure.} = enum
@@ -26,7 +27,7 @@ iterator readLines(): string =
   try:
     while true:
       yield readLine(stdin)
-  except:
+  except CatchableError:
     discard
 
 iterator splitSingle(valueFull: string, optionsWithParameter: HashSet[OptionKey],
diff --git a/src/aur.nim b/src/aur.nim
index 12f6253..78afae5 100644
--- a/src/aur.nim
+++ b/src/aur.nim
@@ -108,7 +108,7 @@ proc getRpcPackageInfosInternal(pkgs: seq[string], repo: string, useTimeout: boo
         (@[], some(getCurrentException().msg))
       except JsonParsingError:
         (@[], some(tr"failed to parse server response"))
-      except:
+      except CatchableError:
         (@[], some(getCurrentException().msg))
 
 proc getRpcPackageInfos*(pkgs: seq[string], repo: string, useTimeout: bool, configColor: bool):
diff --git a/src/common.nim b/src/common.nim
index da36c0d..81badb3 100644
--- a/src/common.nim
+++ b/src/common.nim
@@ -2,6 +2,7 @@ import
   options, os, osproc, posix, sequtils, sets, strutils, sugar, tables,
   args, config, format, lists, package, pacman, utils,
   "wrapper/alpm"
+when not declared(system.stdout): import std/syncio
 
 type
   CacheKind* {.pure.} = enum
@@ -331,7 +332,7 @@ proc createDirRecursive(dir: string, chownUser: Option[User], mkTmp: bool): bool
         if chownUser.isSome and (not exists or index == segments.len - 1):
           discard chown(cstring(path), (Uid) chownUser.unsafeGet.uid, (Gid) chownUser.unsafeGet.gid)
         createDirIndex(index + 1)
-      except:
+      except CatchableError:
         false
     else:
       true
@@ -882,7 +883,7 @@ proc cloneAurReposWithPackageInfos*(config: Config, rpcInfos: seq[RpcPackageInfo
       else:
         let srcInfos = try:
           readFile(repoPath & "/.SRCINFO")
-        except:
+        except CatchableError:
           ""
 
         let addPkgInfos = parseSrcInfo(config.aurRepo, srcInfos, config.common.arch,
diff --git a/src/config.nim b/src/config.nim
index 598b488..a5fab96 100644
--- a/src/config.nim
+++ b/src/config.nim
@@ -1,6 +1,7 @@
 import
   std/[options, posix, re, sequtils, sets, strutils, sugar, tables],
   utils
+when not declared(system.stdout): import std/syncio
 
 type
   ColorMode* {.pure.} = enum
diff --git a/src/feature/syncinstall.nim b/src/feature/syncinstall.nim
index a728851..eaeafe9 100644
--- a/src/feature/syncinstall.nim
+++ b/src/feature/syncinstall.nim
@@ -3,6 +3,7 @@ import
   "../args", "../aur", "../config", "../common", "../format", "../lists", "../package",
     "../pacman", "../utils",
   "../wrapper/alpm"
+when not declared(system.stdout): import std/syncio
 
 type
   Installed = tuple[
@@ -444,7 +445,7 @@ proc buildLoop(config: Config, pkgInfos: seq[PackageInfo], skipDeps: bool,
       finally:
         file.close()
     true
-  except:
+  except CatchableError:
     discard unlink(cstring(workConfFile))
     false
 
@@ -625,7 +626,7 @@ proc installGroupFromSources(config: Config, commonArgs: seq[Argument],
       if clear or not (pair.file in installFiles):
         try:
           removeFile(pair.file)
-        except:
+        except CatchableError:
           discard
 
     if not clear:
diff --git a/src/format.nim b/src/format.nim
index cf4b9db..60c550d 100644
--- a/src/format.nim
+++ b/src/format.nim
@@ -1,6 +1,7 @@
 import
   std/[macros, options, posix, sequtils, strutils, sugar, times, unicode, terminal],
   utils
+when not declared(system.stdout): import std/syncio
 
 type
   PackageLineFormat* = tuple[
diff --git a/src/main.nim b/src/main.nim
index 3960d59..c6745d8 100644
--- a/src/main.nim
+++ b/src/main.nim
@@ -1,6 +1,7 @@
 import
   options, os, posix, re, sequtils, strutils, sugar,
   args, config, format, pacman, utils
+when not declared(system.stdout): import std/syncio
 
 import
   "feature/localquery",
diff --git a/src/package.nim b/src/package.nim
index e48b01f..5c2bf5c 100644
--- a/src/package.nim
+++ b/src/package.nim
@@ -1,6 +1,7 @@
 import
   options, os, re, sequtils, sets, strutils, sugar, tables, utils,
   "wrapper/alpm"
+when not declared(system.stdout): import std/syncio
 
 type
   ConstraintOperation* {.pure.} = enum
@@ -130,7 +131,7 @@ static:
       try:
         if m2[x2] != x1:
           raise newException(CatchableError, "")
-      except:
+      except CatchableError:
         raise newException(CatchableError, "Invalid url <> bareName links")
 
   testBareNamesAndUrls(bareNameToUrl, urlToBareName)
diff --git a/src/pacman.nim b/src/pacman.nim
index c37a54c..2910a90 100644
--- a/src/pacman.nim
+++ b/src/pacman.nim
@@ -1,6 +1,7 @@
 import
   macros, options, posix, sequtils, sets, strutils, sugar, tables,
   args, config, utils
+when not declared(system.stdout): import std/syncio
 
 type
   OpGroup* {.pure.} = enum
@@ -438,7 +439,7 @@ proc obtainPacmanConfig*(args: seq[Argument]): PacmanConfig =
               let line = file.readLine()
               if line.len > 10 and line[0 .. 9] == "keyserver ":
                 pgpKeyserver = some(line[9 .. ^1].strip)
-          except:
+          except CatchableError:
             discard
           finally:
             file.close()
diff --git a/src/utils.nim b/src/utils.nim
index eccde3b..6f8b8d1 100644
--- a/src/utils.nim
+++ b/src/utils.nim
@@ -251,9 +251,12 @@ let initialUser* = try:
     else:
       none(string)
 
-  let uid = uidString.get.parseInt
-  if uid == 0 or currentUser.uid != 0: none(User) else: some(getUser(uid))
-except:
+  if uidString.isSome:
+    let uid = uidString.get.parseInt
+    if uid == 0 or currentUser.uid != 0: none(User) else: some(getUser(uid))
+  else:
+    none(User)
+except CatchableError:
   none(User)
 
 proc canDropPrivileges*(): bool =
@@ -303,7 +306,7 @@ proc execRedirect*(args: varargs[string]): int =
   argSeq.delete(0)
   try:
     p = startProcess(command = args[0], args = argSeq, env = envs, options = {poStdErrToStdOut, poUsePath})
-  except:
+  except CatchableError:
     echo "Error: " & getCurrentExceptionMsg()
     return -1
   var outp = outputStream(p)
@@ -421,7 +424,7 @@ proc toString*[T](arr: array[T, char], length: Option[int]): string =
 proc removeDirQuiet*(s: string) =
   try:
     removeDir(s)
-  except:
+  except CatchableError:
     discard
 
 proc removeTmpDirQuiet*(s: string) =
@@ -432,7 +435,7 @@ proc removeTmpDirQuiet*(s: string) =
     path = s
   try:
     removeDir(path)
-  except:
+  except CatchableError:
     discard
 
 const bashSpecialCharacters = " \t\"'`()[]{}#&|;!\\*~<>?"