diff --git a/config.mk b/config.mk
index 4c4c5d5..973e7c2 100644
--- a/config.mk
+++ b/config.mk
@@ -21,9 +21,10 @@ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
        `$(PKG_CONFIG) --libs freetype2`
 
 # flags
-STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
-STCFLAGS = $(INCS) $(STCPPFLAGS) $(CPPFLAGS) $(CFLAGS)
-STLDFLAGS = $(LIBS) $(LDFLAGS)
+CFLAGS     += -std=c99
+STCPPFLAGS  = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+STCFLAGS    = $(INCS) $(STCPPFLAGS) $(CPPFLAGS) $(CFLAGS)
+STLDFLAGS   = $(LIBS) $(LDFLAGS)
 
 # OpenBSD:
 #CPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600 -D_BSD_SOURCE
@@ -32,4 +33,4 @@ STLDFLAGS = $(LIBS) $(LDFLAGS)
 #       `$(PKG_CONFIG) --libs freetype2`
 
 # compiler and linker
-# CC = c99
+CC = gcc
diff --git a/guix.scm b/guix.scm
new file mode 100644
index 0000000..ccafce4
--- /dev/null
+++ b/guix.scm
@@ -0,0 +1,24 @@
+;;; st - simple terminal
+;;; See LICENSE file for copyright and license details.
+
+(use-modules (guix packages)
+             (guix download)
+             (guix git-download)
+             (guix gexp)
+             (guix build-system gnu)
+             (gnu packages suckless))
+
+(define %source-dir (dirname (current-filename)))
+
+(define vilor-st
+  (package
+    (inherit st)
+    (name "vilor-st")
+    (version "git")
+    (source (local-file %source-dir
+                        #:recursive? #t
+                        #:select? (git-predicate %source-dir)))
+    (home-page "https://notabug.org/vilor/st")
+    (synopsis "Patched and configured st 0.8.5")))
+
+vilor-st
diff --git a/manifest.scm b/manifest.scm
new file mode 100644
index 0000000..deec587
--- /dev/null
+++ b/manifest.scm
@@ -0,0 +1,11 @@
+;;; st - simple terminal
+;;; See LICENSE file for copyright and license details.
+
+(specifications->manifest
+  '("bash-minimal"
+    "coreutils"
+    "pkg-config"
+    "gcc-toolchain"
+    "libxft"
+    "libx11"
+    "make"))