diff --git a/docs/compile/builder-linux/build_deps.sh b/docs/compile/builder-linux/build_deps.sh
index a3e34a3..f5a4144 100755
--- a/docs/compile/builder-linux/build_deps.sh
+++ b/docs/compile/builder-linux/build_deps.sh
@@ -7,22 +7,22 @@ EXEDIR="$(cd "$EXEDIR"; pwd)"
 
 dl_deps()
 {
-	if [ -d "$DEPS" ]; then
-		dir_is_not_empty "$DEPS" && {
-			echo "deps dir is not empty. if you want to redownload - delete it."
-			return
-		}
-	else
-		mkdir "$DEPS"
-	fi
-	pushd "$DEPS"
-	curl -Lo - https://www.netfilter.org/pub/libnfnetlink/libnfnetlink-1.0.2.tar.bz2 | tar -xj
-	curl -Lo - https://www.netfilter.org/pub/libmnl/libmnl-1.0.5.tar.bz2 | tar -xj
-	curl -Lo - https://www.netfilter.org/pub/libnetfilter_queue/libnetfilter_queue-1.0.5.tar.bz2 | tar -xj
-	curl -Lo - https://zlib.net/zlib-1.3.1.tar.gz | tar -xz
-	curl -Lo - https://github.com/openresty/luajit2/archive/refs/tags/v${LUAJIT_RELEASE}.tar.gz | tar -xz
-	curl -Lo - https://www.lua.org/ftp/lua-${LUA_RELEASE}.tar.gz | tar -xz
-	popd
+	[ -d "$DEPS" ] || mkdir -p "$DEPS"
+	(
+	cd "$DEPS"
+	exists_dir libnfnetlink-* ||
+		curl -Lo - https://www.netfilter.org/pub/libnfnetlink/libnfnetlink-1.0.2.tar.bz2 | tar -xj || exit 5
+	exists_dir libmnl-* ||
+		curl -Lo - https://www.netfilter.org/pub/libmnl/libmnl-1.0.5.tar.bz2 | tar -xj || exit 5
+	exists_dir libnetfilter_queue-* ||
+		curl -Lo - https://www.netfilter.org/pub/libnetfilter_queue/libnetfilter_queue-1.0.5.tar.bz2 | tar -xj || exit 5
+	exists_dir zlib-* ||
+		curl -Lo - https://zlib.net/fossils/zlib-1.3.1.tar.gz | tar -xz || exit 5
+	exists_dir luajit2-* ||
+		curl -Lo - https://github.com/openresty/luajit2/archive/refs/tags/v${LUAJIT_RELEASE}.tar.gz | tar -xz || exit 5
+	exists_dir lua-* ||
+		curl -Lo - https://www.lua.org/ftp/lua-${LUA_RELEASE}.tar.gz | tar -xz || exit 5
+	)
 }
 
 build_netlink()
@@ -83,6 +83,8 @@ build_luajit_for_target()
 	}
 }
 
+check_prog curl tar gzip bzip2 sed make cc pkg-config
+check_h_files
 dl_deps
 check_toolchains
 ask_target
@@ -90,7 +92,7 @@ ask_target
 for t in $TGT; do
 	buildenv $t
 	pushd "$DEPS"
-	bsd_files
+	install_h_files
 	build_netlink
 	build_zlib
 	build_lua
diff --git a/docs/compile/builder-linux/build_zapret1.sh b/docs/compile/builder-linux/build_zapret1.sh
new file mode 100755
index 0000000..c539bfd
--- /dev/null
+++ b/docs/compile/builder-linux/build_zapret1.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+
+EXEDIR="$(dirname "$0")"
+EXEDIR="$(cd "$EXEDIR"; pwd)"
+
+. "$EXEDIR/common.inc"
+
+ZDIR="zapret"
+ZBASE="$EXEDIR"
+BRANCH=master
+ZURL=https://github.com/bol-van/zapret/archive/refs/heads/${BRANCH}.zip
+ZBIN="$EXEDIR/binaries"
+
+dl_zapret1()
+{
+	if [ -d "$ZBASE/$ZDIR" ]; then
+		dir_is_not_empty "$ZBASE/$ZDIR" && {
+			echo "zapret dir is not empty. if you want to redownload - delete it."
+			return
+		}
+		rmdir "$ZBASE/$ZDIR"
+	fi
+	(
+	cd "$ZBASE"
+	curl -Lo /tmp/zapret.zip "$ZURL"
+	unzip /tmp/zapret.zip
+	rm /tmp/zapret.zip
+	mv zapret-${BRANCH} $ZDIR
+	)
+}
+
+check_prog curl unzip make
+dl_zapret1
+check_toolchains
+ask_target
+
+[ -d "$ZBIN" ] || mkdir -p "$ZBIN"
+
+for t in $TGT; do
+	buildenv $t
+
+	translate_target $t || {
+		echo COULD NOT TRANSLATE TARGET $t TO BIN DIR
+		continue
+	}
+
+	pushd $ZBASE/$ZDIR
+
+	OPTIMIZE=-Oz \
+	CFLAGS="-static-libgcc -static -I$STAGING_DIR/include $MINSIZE $CFLAGS" \
+	LDFLAGS="-L$STAGING_DIR/lib $LDMINSIZE $LDFLAGS" \
+	make
+
+	[ -d "$ZBIN/$ZBINTARGET" ] || mkdir "$ZBIN/$ZBINTARGET"
+	cp -f binaries/my/* "$ZBIN/$ZBINTARGET"
+
+	popd
+
+	buildenv_clear
+done
+
diff --git a/docs/compile/builder-linux/build_zapret2.sh b/docs/compile/builder-linux/build_zapret2.sh
index 6a74250..1300b31 100755
--- a/docs/compile/builder-linux/build_zapret2.sh
+++ b/docs/compile/builder-linux/build_zapret2.sh
@@ -20,53 +20,16 @@ dl_zapret2()
 		}
 		rmdir "$ZBASE/$ZDIR"
 	fi
-	pushd "$ZBASE"
+	(
+	cd "$ZBASE"
 	curl -Lo /tmp/zapret2.zip "$ZURL"
 	unzip /tmp/zapret2.zip
 	rm /tmp/zapret2.zip
 	mv zapret2-${BRANCH} $ZDIR
-	popd
-}
-
-translate_target()
-{
-	case $1 in
-		aarch64-unknown-linux-musl)
-			ZBINTARGET=linux-arm64
-			;;
-		arm-unknown-linux-musleabi)
-			ZBINTARGET=linux-arm
-			;;
-		x86_64-unknown-linux-musl)
-			ZBINTARGET=linux-x86_64
-			;;
-		i586-unknown-linux-musl)
-			ZBINTARGET=linux-x86
-			;;
-		mips-unknown-linux-muslsf)
-			ZBINTARGET=linux-mips
-			;;
-		mipsel-unknown-linux-muslsf)
-			ZBINTARGET=linux-mipsel
-			;;
-		mips64-unknown-linux-musl)
-			ZBINTARGET=linux-mips64
-			;;
-		mips64el-unknown-linux-musl)
-			ZBINTARGET=linux-mipsel64
-			;;
-		powerpc-unknown-linux-musl)
-			ZBINTARGET=linux-ppc
-			;;
-		riscv64-unknown-linux-musl)
-			ZBINTARGET=linux-riscv64
-			;;
-		*)
-			return 1
-	esac
-	return 0
+	)
 }
 
+check_prog curl unzip make
 dl_zapret2
 check_toolchains
 ask_target
@@ -94,7 +57,7 @@ for t in $TGT; do
 
 	OPTIMIZE=-Oz \
 	CFLAGS="-static-libgcc -static -I$STAGING_DIR/include $CFLAGS" \
-	LDFLAGS="-L$DEPS_DIR/lib $LDFLAGS" \
+	LDFLAGS="-L$STAGING_DIR/lib $LDFLAGS" \
 	make LUA_JIT=$LJIT LUA_CFLAGS="$LCFLAGS" LUA_LIB="$LLIB"
 
 	[ -d "$ZBIN/$ZBINTARGET" ] || mkdir "$ZBIN/$ZBINTARGET"
diff --git a/docs/compile/builder-linux/common.inc b/docs/compile/builder-linux/common.inc
index 9af7d18..a9d5ce1 100644
--- a/docs/compile/builder-linux/common.inc
+++ b/docs/compile/builder-linux/common.inc
@@ -46,9 +46,14 @@ target_has_luajit()
 	return 1
 }
 
-bsd_files()
+REQD_H_FILES="/usr/include/x86_64-linux-gnu/sys/queue.h /usr/include/sys/capability.h"
+check_h_files()
 {
-	install -Dm644 -t $STAGING_DIR/include/sys /usr/include/x86_64-linux-gnu/sys/queue.h /usr/include/sys/capability.h
+	check_file $REQD_H_FILES
+}
+install_h_files()
+{
+	install -Dm644 -t $STAGING_DIR/include/sys $REQD_H_FILES
 }
 
 buildenv()
@@ -78,6 +83,33 @@ buildenv_clear()
 	OLDPATH=
 }
 
+which()
+{
+	# on some systems 'which' command is considered deprecated and not installed by default
+	# 'command -v' replacement does not work exactly the same way. it outputs shell aliases if present
+	# $1 - executable name
+	local IFS=:
+	[ "$1" != "${1#/}" ] && [ -x "$1" ] && {
+		echo "$1"
+		return 0
+	}
+	for p in $PATH; do
+	    [ -x "$p/$1" ] && {
+		echo "$p/$1"
+		return 0
+	    }
+	done
+	return 1
+}
+exists()
+{
+	which "$1" >/dev/null 2>/dev/null
+}
+exists_dir()
+{
+	# use $1, ignore other args
+	[ -d "$1" ]
+}
 
 dir_is_not_empty()
 {
@@ -168,3 +200,64 @@ check_toolchains()
 		exit 1
 	}
 }
+
+check_prog()
+{
+	while [ -n "$1" ]; do
+		exists $1 || {
+			echo $1 is not available
+			echo "debian/ubuntu: apt install curl xz-utils bzip2 unzip make gcc libcap-dev pkg-config"
+			exit 10
+		}
+		shift
+	done
+}
+check_file()
+{
+	while [ -n "$1" ]; do
+		[ -f "$1" ] || {
+			echo $1 is not available
+			exit 10
+		}
+		shift
+	done
+}
+
+translate_target()
+{
+	case $1 in
+		aarch64-unknown-linux-musl)
+			ZBINTARGET=linux-arm64
+			;;
+		arm-unknown-linux-musleabi)
+			ZBINTARGET=linux-arm
+			;;
+		x86_64-unknown-linux-musl)
+			ZBINTARGET=linux-x86_64
+			;;
+		i586-unknown-linux-musl)
+			ZBINTARGET=linux-x86
+			;;
+		mips-unknown-linux-muslsf)
+			ZBINTARGET=linux-mips
+			;;
+		mipsel-unknown-linux-muslsf)
+			ZBINTARGET=linux-mipsel
+			;;
+		mips64-unknown-linux-musl)
+			ZBINTARGET=linux-mips64
+			;;
+		mips64el-unknown-linux-musl)
+			ZBINTARGET=linux-mipsel64
+			;;
+		powerpc-unknown-linux-musl)
+			ZBINTARGET=linux-ppc
+			;;
+		riscv64-unknown-linux-musl)
+			ZBINTARGET=linux-riscv64
+			;;
+		*)
+			return 1
+	esac
+	return 0
+}
diff --git a/docs/compile/builder-linux/get_toolchains.sh b/docs/compile/builder-linux/get_toolchains.sh
index b3c13df..d47c0f9 100755
--- a/docs/compile/builder-linux/get_toolchains.sh
+++ b/docs/compile/builder-linux/get_toolchains.sh
@@ -7,13 +7,16 @@ EXEDIR="$(cd "$EXEDIR"; pwd)"
 
 BASEURL=https://github.com/bol-van/musl-cross/releases/download/latest
 
+check_prog curl tar xz
+
 [ -d "$TOOLCHAINS" ] || mkdir -p "$TOOLCHAINS"
 
 ask_target 1
 
-pushd "$TOOLCHAINS"
+(
+cd "$TOOLCHAINS"
 for t in $TGT; do
 	[ -d "$t" ] && rm -r "$t"
 	curl -Lo - "${BASEURL}/${t}.tar.xz" | tar -Jx
 done
-popd
+)